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* module/zfs: remove zfs_zevent_console and zfs_zevent_colsнаб2021-05-102-31/+0
| | | | | | | | | | | | | | | zfs_zevent_console committed multiple printk()s per line without properly continuing them ‒ a single event could easily be fragmented across over thirty lines, making it useless for direct application zfs_zevent_cols exists purely to wrap the output from zfs_zevent_console The niche this was supposed to fill can be better served by something akin to the all-syslog ZEDLET Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Ahelenia Ziemiańska <[email protected]> Closes #7082 Closes #11996
* Add SIGSTOP and SIGTSTP handling to issigPaul Dagnelie2021-04-152-17/+14
| | | | | | | | | | | | | | | | This change adds SIGSTOP and SIGTSTP handling to the issig function; this mirrors its behavior on Solaris. This way, long running kernel tasks can be stopped with the appropriate signals. Note that doing so with ctrl-z on the command line doesn't return control of the tty to the shell, because tty handling is done separately from stopping the process. That can be future work, if people feel that it is a necessary addition. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Matthew Ahrens <[email protected]> Signed-off-by: Paul Dagnelie <[email protected]> Issue #810 Issue #10843 Closes #11801
* Microoptimizations for VERIFY() and friendsAdam D. Moss2021-03-111-39/+39
| | | | | | | | | Add branch hints and constify the intermediate evaluations of left/right params in VERIFY3*(). Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Adam Moss <[email protected]> Closes #11708
* Cleaning up uio headersBrian Atkinson2021-02-201-20/+2
| | | | | | | | | Making uio_impl.h the common header interface between Linux and FreeBSD so both OS's can share a common header file. This also helps reduce code duplication for zfs_uio_t for each OS. Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Brian Atkinson <[email protected]> Closes #11622
* Remove unused iov_iter_init_compat() wrapperBrian Behlendorf2021-01-301-13/+0
| | | | | | | | | | This compatibility code is no longer needed. For it a while iov_iter_init_compat() was used by zfs_uio_prefaultpages() but this code should have been dropped as part of commit 83b91ae1. Take care of that oversight and remove it. Reviewed-by: Brian Atkinson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #11543
* Extending FreeBSD UIO StructBrian Atkinson2021-01-201-25/+35
| | | | | | | | | | | | | | In FreeBSD the struct uio was just a typedef to uio_t. In order to extend this struct, outside of the definition for the struct uio, the struct uio has been embedded inside of a uio_t struct. Also renamed all the uio_* interfaces to be zfs_uio_* to make it clear this is a ZFS interface. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Jorgen Lundman <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Brian Atkinson <[email protected]> Closes #11438
* Linux 5.10 compat: use iov_iter in uio structureBrian Behlendorf2020-12-181-2/+68
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As of the 5.10 kernel the generic splice compatibility code has been removed. All filesystems are now responsible for registering a ->splice_read and ->splice_write callback to support this operation. The good news is the VFS provided generic_file_splice_read() and iter_file_splice_write() callbacks can be used provided the ->iter_read and ->iter_write callback support pipes. However, this is currently not the case and only iovecs and bvecs (not pipes) are ever attached to the uio structure. This commit changes that by allowing full iov_iter structures to be attached to uios. Ever since the 4.9 kernel the iov_iter structure has supported iovecs, kvecs, bvevs, and pipes so it's desirable to pass the entire thing when possible. In conjunction with this the uio helper functions (i.e uiomove(), uiocopy(), etc) have been updated to understand the new UIO_ITER type. Note that using the kernel provided uio_iter interfaces allowed the existing Linux specific uio handling code to be simplified. When there's no longer a need to support kernel's older than 4.9, then it will be possible to remove the iovec and bvec members from the uio structure and always use a uio_iter. Until then we need to maintain all of the existing types for older kernels. Some additional refactoring and cleanup was included in this change: - Added checks to configure to detect available iov_iter interfaces. Some are available all the way back to the 3.10 kernel and are used when available. In particular, uio_prefaultpages() now always uses iov_iter_fault_in_readable() which is available for all supported kernels. - The unused UIO_USERISPACE type has been removed. It is no longer needed now that the uio_seg enum is platform specific. - Moved zfs_uio.c from the zcommon.ko module to the Linux specific platform code for the zfs.ko module. This gets it out of libzfs where it was never needed and keeps this Linux specific code out of the common sources. - Removed unnecessary O_APPEND handling from zfs_iter_write(), this is redundant and O_APPEND is already handled in zfs_write(); Reviewed-by: Colin Ian King <[email protected]> Reviewed-by: Tony Hutter <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #11351
* Implement memory and CPU hotplugPaul Dagnelie2020-12-101-0/+5
| | | | | | | | | | | | | | ZFS currently doesn't react to hotplugging cpu or memory into the system in any way. This patch changes that by adding logic to the ARC that allows the system to take advantage of new memory that is added for caching purposes. It also adds logic to the taskq infrastructure to support dynamically expanding the number of threads allocated to a taskq. Reviewed-by: Brian Behlendorf <[email protected]> Co-authored-by: Matthew Ahrens <[email protected]> Co-authored-by: Brian Behlendorf <[email protected]> Signed-off-by: Paul Dagnelie <[email protected]> Closes #11212
* Introduce CPU_SEQID_UNSTABLEMateusz Guzik2020-11-021-0/+1
| | | | | | | | | | | | | | | | | | Current CPU_SEQID users don't care about possibly changing CPU ID, but enclose it within kpreempt disable/enable in order to fend off warnings from Linux's CONFIG_DEBUG_PREEMPT. There is no need to do it. The expected way to get CPU ID while allowing for migration is to use raw_smp_processor_id. In order to make this future-proof this patch keeps CPU_SEQID as is and introduces CPU_SEQID_UNSTABLE instead, to make it clear that consumers explicitly want this behavior. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Matt Macy <[email protected]> Signed-off-by: Mateusz Guzik <[email protected]> Closes #11142
* Consolidate zfs_holey and zfs_accessMatthew Macy2020-10-311-0/+6
| | | | | | | | | The zfs_holey() and zfs_access() functions can be made common to both FreeBSD and Linux. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Signed-off-by: Matt Macy <[email protected]> Closes #11125
* Remove UIO_ZEROCOPY functions structuresMatthew Macy2020-10-301-43/+0
| | | | | | | | | | The original xuio zero copy functionality has always been unused on Linux and FreeBSD. Remove this disabled code to avoid any confusion and improve readability. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Signed-off-by: Matt Macy <[email protected]> Closes #11124
* Share zfs_fsync, zfs_read, zfs_write, et al between Linux and FreeBSDMatthew Macy2020-10-211-1/+1
| | | | | | | | | | The zfs_fsync, zfs_read, and zfs_write function are almost identical between Linux and FreeBSD. With a little refactoring they can be moved to the common code which is what is done by this commit. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Signed-off-by: Matt Macy <[email protected]> Closes #11078
* Replace ZFS on Linux references with OpenZFSBrian Behlendorf2020-10-0853-53/+0
| | | | | | | | | | | | | This change updates the documentation to refer to the project as OpenZFS instead ZFS on Linux. Web links have been updated to refer to https://github.com/openzfs/zfs. The extraneous zfsonlinux.org web links in the ZED and SPL sources have been dropped. Reviewed-by: George Melikov <[email protected]> Reviewed-by: Richard Laager <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #11007
* FreeBSD: Add support for procfs_listMatthew Macy2020-09-231-0/+1
| | | | | | | | | | The procfs_list interface is required by several kstats. Implement this functionality for FreeBSD to provide access to these kstats. Reviewed-by: Allan Jude <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matt Macy <[email protected]> Closes #10890
* Replace cv_{timed}wait_sig with cv_{timed}wait_idle where appropriateMatthew Macy2020-09-031-0/+7
| | | | | | | | | | | | | | | | There are a number of places where cv_?_sig is used simply for accounting purposes but the surrounding code has no ability to cope with actually receiving a signal. On FreeBSD it is possible to send signals to individual kernel threads so this could enable undesirable behavior. This patch adds routines on Linux that will do the same idle accounting as _sig without making the task interruptible. On FreeBSD cv_*_idle are all aliases for cv_* Reviewed-by: Alexander Motin <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matt Macy <[email protected]> Closes #10843
* Linux 5.9 compat: NR_SLAB_RECLAIMABLEBrian Behlendorf2020-08-291-11/+0
| | | | | | | | | | | | | | | | | | | Commit dcdc12e added compatibility code to treat NR_SLAB_RECLAIMABLE_B as if it were the same as NR_SLAB_RECLAIMABLE. However, the new value is in bytes while the old value was in pages which means they are not interchangeable. The only place the reclaimable slab size is used is as a component of the calculation done by arc_free_memory(). This function returns the amount of memory the ARC considers to be free or reclaimable at little cost. Rather than switch to a new interface to get this value it has been removed it from the calculation. It is normally a minor component compared to the number of inactive or free pages, and removing it aligns the behavior with the FreeBSD version of arc_free_memory(). Reviewed-by: Matthew Ahrens <[email protected]> Reviewed-by: Coleman Kane <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #10834
* Linux 5.7 compat: Include linux/sched.h in spl/sys/mutex.hPavel Snajdr2020-08-191-0/+1
| | | | | | | | | struct task_struct is needed for lockdep_off() in mutex.h This has popped up after e616cb8daadf (in linux-5.7-rc7). Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Pavel Snajdr <[email protected]> Closes #10741
* Remove KMC_KMEM and KMC_VMEMMatthew Ahrens2020-08-171-4/+0
| | | | | | | | | | | | | | | | | `KMC_KMEM` and `KMC_VMEM` are now unused since all SPL-implemented caches are `KMC_KVMEM`. KMC_KMEM: Given the default value of `spl_kmem_cache_kmem_limit`, we don't use kmalloc to back the SPL caches, instead we use kvmalloc (KMC_KVMEM). The flag, module parameter, /proc entries, and associated code are removed. KMC_VMEM: This flag is not used, and kvmalloc() is always preferable to vmalloc(). The flag, /proc entries, and associated code are removed. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Signed-off-by: Matthew Ahrens <[email protected]> Closes #10673
* Linux 5.9 compat: Update NR_SLAB_RECLAIMABLE to NR_SLAB_RECLAIMABLE_BColeman Kane2020-08-111-0/+7
| | | | | | | | | | | | This change appears to primarily be a name change for the enum. Had to update the test logic so that it works so long as either one of these is present (favoring the newer one). Additionally, as this is newer, it only shows up in node_page_item, so this commit doesn't test zone_page_item for the same enum. Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Coleman Kane <[email protected]> Closes #10696
* Remove KMC_NOMAGAZINEMatthew Ahrens2020-08-051-2/+0
| | | | | | | | | Remove dead code to make the implementation easier to understand. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matt Ahrens <[email protected]> Closes #10650
* Remove KMC_QCACHEMatthew Ahrens2020-08-051-2/+0
| | | | | | | | | Remove dead code to make the implementation easier to understand. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matt Ahrens <[email protected]> Closes #10650
* Remove KMC_NOHASHMatthew Ahrens2020-08-051-2/+0
| | | | | | | | | Remove dead code to make the implementation easier to understand. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matt Ahrens <[email protected]> Closes #10650
* Remove KMC_NOTOUCHMatthew Ahrens2020-08-051-2/+0
| | | | | | | | | Remove dead code to make the implementation easier to understand. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matt Ahrens <[email protected]> Closes #10650
* Remove KMC_OFFSLABMatthew Ahrens2020-08-051-2/+0
| | | | | | | | | Remove dead code to make the implementation easier to understand. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matt Ahrens <[email protected]> Closes #10650
* Revise ARC shrinker algorithmMatthew Ahrens2020-07-311-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The ARC shrinker callback `arc_shrinker_count/_scan()` is invoked by the kernel's shrinker mechanism when the system is running low on free pages. This happens via 2 code paths: 1. "direct reclaim": The system is attempting to allocate a page, but we are low on memory. The ARC shrinker callback is invoked from the page-allocation code path. 2. "indirect reclaim": kswapd notices that there aren't many free pages, so it invokes the ARC shrinker callback. In both cases, the kernel's shrinker code requests that the ARC shrinker callback release some of its cache, and then it measures how many pages were released. However, it's measurement of released pages does not include pages that are freed via `__free_pages()`, which is how the ARC releases memory (via `abd_free_chunks()`). Rather, the kernel shrinker code is looking for pages to be placed on the lists of reclaimable pages (which is separate from actually-free pages). Because the kernel shrinker code doesn't detect that the ARC has released pages, it may call the ARC shrinker callback many times, resulting in the ARC "collapsing" down to `arc_c_min`. This has several negative impacts: 1. ZFS doesn't use RAM to cache data effectively. 2. In the direct reclaim case, a single page allocation may wait a long time (e.g. more than a minute) while we evict the entire ARC. 3. Even with the improvements made in 67c0f0dedc5 ("ARC shrinking blocks reads/writes"), occasionally `arc_size` may stay above `arc_c` for the entire time of the ARC collapse, thus blocking ZFS read/write operations in `arc_get_data_impl()`. To address these issues, this commit limits the ways that the ARC shrinker callback can be used by the kernel shrinker code, and mitigates the impact of arc_is_overflowing() on ZFS read/write operations. With this commit: 1. We limit the amount of data that can be reclaimed from the ARC via the "direct reclaim" shrinker. This limits the amount of time it takes to allocate a single page. 2. We do not allow the ARC to shrink via kswapd (indirect reclaim). Instead we rely on `arc_evict_zthr` to monitor free memory and reduce the ARC target size to keep sufficient free memory in the system. Note that we can't simply rely on limiting the amount that we reclaim at once (as for the direct reclaim case), because kswapd's "boosted" logic can invoke the callback an unlimited number of times (see `balance_pgdat()`). 3. When `arc_is_overflowing()` and we want to allocate memory, `arc_get_data_impl()` will wait only for a multiple of the requested amount of data to be evicted, rather than waiting for the ARC to no longer be overflowing. This allows ZFS reads/writes to make progress even while the ARC is overflowing, while also ensuring that the eviction thread makes progress towards reducing the total amount of memory used by the ARC. 4. The amount of memory that the ARC always tries to keep free for the rest of the system, `arc_sys_free` is increased. 5. Now that the shrinker callback is able to provide feedback to the kernel's shrinker code about our progress, we can safely enable the kswapd hook. This will allow the arc to receive notifications when memory pressure is first detected by the kernel. We also re-enable the appropriate kstats to track these callbacks. Reviewed-by: Alexander Motin <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Co-authored-by: George Wilson <[email protected]> Signed-off-by: Matthew Ahrens <[email protected]> Closes #10600
* Introduce names for ZTHRsSerapheim Dimitropoulos2020-07-291-0/+5
| | | | | | | | | | | | When debugging issues or generally analyzing the runtime of a system it would be nice to be able to tell the different ZTHRs running by name rather than having to analyze their stack. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Matthew Ahrens <[email protected]> Co-authored-by: Ryan Moeller <[email protected]> Signed-off-by: Serapheim Dimitropoulos <[email protected]> Closes #10630
* Prefix zfs internal endian checks with _ZFSMatthew Macy2020-07-282-20/+21
| | | | | | | | | | | FreeBSD defines _BIG_ENDIAN BIG_ENDIAN _LITTLE_ENDIAN LITTLE_ENDIAN on every architecture. Trying to do cross builds whilst hiding this from ZFS has proven extremely cumbersome. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matt Macy <[email protected]> Closes #10621
* remove kmem_cache module parameter KMC_EXPIRE_AGEMatthew Ahrens2020-07-241-8/+0
| | | | | | | | | | | | | | | | | | | | By default, `spl_kmem_cache_expire` is `KMC_EXPIRE_MEM`, meaning that objects will be removed from kmem cache magazines by `spl_kmem_cache_reap_now()`. There is also a module parameter to change this to `KMC_EXPIRE_AGE`, which establishes a maximum lifetime for objects to stay in the magazine. This setting has rarely, if ever, been used, and is not regularly tested. This commit removes the code for `KMC_EXPIRE_AGE`, and associated module parameters. Additionally, the unused module parameter `spl_kmem_cache_obj_per_slab_min` is removed. Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matthew Ahrens <[email protected]> Closes #10608
* Remove skc_reclaim, hdr_recl, kmem_cache shrinkerMatthew Ahrens2020-07-191-3/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The SPL kmem_cache implementation provides a mechanism, `skc_reclaim`, whereby individual caches can register a callback to be invoked when there is memory pressure. This mechanism is used in only one place: the ARC registers the `hdr_recl()` reclaim function. This function wakes up the `arc_reap_zthr`, whose job is to call `kmem_cache_reap()` and `arc_reduce_target_size()`. The `skc_reclaim` callbacks are invoked only by shrinker callbacks and `arc_reap_zthr`, and only callback only wakes up `arc_reap_zthr`. When called from `arc_reap_zthr`, waking `arc_reap_zthr` is a no-op. When called from shrinker callbacks, we are already aware of memory pressure and responding to it. Therefore there is little benefit to ever calling the `hdr_recl()` `skc_reclaim` callback. The `arc_reap_zthr` also wakes once a second, and if memory is low when allocating an ARC buffer. Therefore, additionally waking it from the shrinker calbacks has little benefit. The shrinker callbacks can be invoked very frequently, e.g. 10,000 times per second. Additionally, for invocation of the shrinker callback, skc_reclaim is invoked many times. Therefore, this mechanism consumes significant amounts of CPU time. The kmem_cache shrinker calls `spl_kmem_cache_reap_now()`, which, in addition to invoking `skc_reclaim()`, does two things to attempt to free pages for use by the system: 1. Return free objects from the magazine layer to the slab layer 2. Return entirely-free slabs to the page layer (i.e. free pages) These actions apply only to caches implemented by the SPL, not those that use the underlying kernel SLAB/SLUB caches. The SPL caches are used for objects >=32KB, which are primarily linear ABD's cached in the DBUF cache. These actions (freeing objects from the magazine layer and returning entirely-free slabs) are also taken whenever a `kmem_cache_free()` call finds a full magazine. So there would typically be zero entirely-free slabs, and the number of objects in magazines is limited (typically no more than 64 objects per magazine, and there's one magazine per CPU). Therefore the benefit of `spl_kmem_cache_reap_now()`, while nonzero, is modest. We also call `spl_kmem_cache_reap_now()` from the `arc_reap_zthr`, when memory pressure is detected. Therefore, calling `spl_kmem_cache_reap_now()` from the kmem_cache shrinker is not needed. This commit removes the `skc_reclaim` mechanism, its only callback `hdr_recl()`, and the kmem_cache shrinker callback. Reviewed-By: Brian Behlendorf <[email protected]> Reviewed-by: George Wilson <[email protected]> Reviewed-by: Pavel Zakharov <[email protected]> Signed-off-by: Matthew Ahrens <[email protected]> Closes #10576
* Fixing gang ABD child removal race conditionBrian Atkinson2020-07-141-1/+3
| | | | | | | | | | | | | | | | | | | | On linux the list debug code has been setting off a failure when checking that the node->next->prev value is pointing back at the node. At times this check evaluates to 0xdead. When removing a child from a gang ABD we must acquire the child's abd_mtx to make sure that the same ABD is not being added to another gang ABD while it is being removed from a gang ABD. This fixes a race condition when checking if an ABDs link is already active and part of another gang ABD before adding it to a gang. Added additional debug code for the gang ABD in abd_verify() to make sure each child ABD has active links. Also check to make sure another gang ABD is not added to a gang ABD. Reviewed-by: Serapheim Dimitropoulos <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Matt Ahrens <[email protected]> Signed-off-by: Brian Atkinson <[email protected]> Closes #10511
* Clean up OS-specific ARC and kmem codeMatthew Ahrens2020-06-292-12/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | OS-specific code (e.g. under `module/os/linux`) does not need to share its code structure with any other operating systems. In particular, the ARC and kmem code need not be similar to the code in illumos, because we won't be syncing this OS-specific code between operating systems. For example, if/when illumos support is added to the common repo, we would add a file `module/os/illumos/zfs/arc_os.c` for the illumos versions of this code. Therefore, we can simplify the code in the OS-specific ARC and kmem routines. These changes do not impact system behavior, they are purely code cleanup. The changes are: Arenas are not used on Linux or FreeBSD (they are always `NULL`), so `heap_arena`, `zio_arena`, and `zio_alloc_arena` can be removed, along with code that uses them. In `arc_available_memory()`: * `desfree` is unused, remove it * rename `freemem` to avoid conflict with pre-existing `#define` * remove checks related to arenas * use units of bytes, rather than converting from bytes to pages and then back to bytes `SPL_KMEM_CACHE_REAP` is unused, remove it. `skc_reap` is unused, remove it. The `count` argument to `spl_kmem_cache_reap_now()` is unused, remove it. `vmem_size()` and associated type and macros are unused, remove them. In `arc_memory_throttle()`, use a less confusing variable name to store the result of `arc_free_memory()`. Reviewed-by: George Wilson <[email protected]> Reviewed-by: Pavel Zakharov <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Signed-off-by: Matthew Ahrens <[email protected]> Closes #10499
* Style fixesBrian Behlendorf2020-06-271-1/+1
| | | | | | | * Fix cstyle issue in shrinker.h which exceeded 80 columns. * Silence shellcheck warning in zpool.d/smart script. Signed-off-by: Brian Behlendorf <[email protected]>
* Revise SPL wrapper for shrinker callbacksMatthew Ahrens2020-06-271-82/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The SPL provides a wrapper for the kernel's shrinker callbacks, which enables the ZFS code to interface with multiple versions of the shrinker API's from different kernel versions. Specifically, Linux kernels 3.0 - 3.11 has a single "combined" callback, and Linux kernels 3.12 and later have two "split" callbacks. The SPL provides a wrapper function so that the ZFS code only needs to implement one version of the callbacks. Currently the SPL's wrappers are designed such that the ZFS code implements the older, "combined" callback. There are a few downsides to this approach: * The general design within ZFS is for the latest Linux kernel to be considered the "first class" API. * The newer, "split" callback API is easier to understand, because each callback has one purpose. * The current wrappers do not completely abstract out the differing API's, so ZFS code needs `#ifdef` code to handle the differing return values required for different kernel versions. This commit addresses these drawbacks by having the ZFS code provide the latest, "split" callbacks, and the SPL provides a wrapping function for the older, "combined" API. Reviewed-by: Pavel Zakharov <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matthew Ahrens <[email protected]> Closes #10502
* Use percpu_counter for obj_alloc counter of Linux-backed cachesSerapheim Dimitropoulos2020-06-261-0/+1
| | | | | | | | | | | | | | | | | | | | | | | A previous commit enabled the tracking of object allocations in Linux-backed caches from the SPL layer for debuggability. The commit is: 9a170fc6fe54f1e852b6c39630fe5ef2bbd97c16 Unfortunately, it also introduced minor performance regressions that were highlighted by the ZFS perf test-suite. Within Delphix we found that the regression would be from -1%, all the way up to -8% for some workloads. This commit brings performance back up to par by creating a separate counter for those caches and making it a percpu in order to avoid lock-contention. The initial performance testing was done by myself, and the final round was conducted by @tonynguien who was also the one that discovered the regression and highlighted the culprit. Reviewed-by: Matt Ahrens <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Serapheim Dimitropoulos <[email protected]> Closes #10397
* Drop unnecessary srcdir pathsArvind Sankar2020-06-241-58/+58
| | | | | | | | | | There's no need to specify the srcdir explicitly in _HEADERS and EXTRA_DIST. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Arvind Sankar <[email protected]> Closes #10493
* Add prototypesArvind Sankar2020-06-181-13/+18
| | | | | | | | | Add prototypes/move prototypes to header files. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Arvind Sankar <[email protected]> Closes #10470
* Mark functions as staticArvind Sankar2020-06-181-15/+2
| | | | | | | | | | | Mark functions used only in the same translation unit as static. This only includes functions that do not have a prototype in a header file either. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Arvind Sankar <[email protected]> Closes #10470
* Disambiguate condvar API contractMatthew Macy2020-06-181-9/+39
| | | | | | | | | | | | | | | | | | | | | | | | | | | On Illumos callers of cv_timedwait and cv_timedwait_hires can't distinguish between whether or not the cv was signaled or the call timed out. Illumos handles this (for some definition of handles) by calling cv_signal in the return path if we were signaled but the return value indicates instead that we timed out. This would make sense if it were possible to query the the cv for its net signal disposition. However, this isn't possible and, in spite of the fact that there are places in the code that clearly take a different and incompatible path if a timeout value is indicated, this distinction appears to be rather subtle to most developers. This problem is further compounded by the fact that on Linux, calling cv_signal in the return path wouldn't even do the right thing unless there are other waiters. Since it is possible for the caller to independently determine how much time is remaining but it is not possible to query if the cv was in fact signaled, prioritizing signalling over timeout seems like a cleaner solution. In addition, judging from usage patterns within the code itself, it is also less error prone. Reviewed-by: Jorgen Lundman <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Alexander Motin <[email protected]> Signed-off-by: Matt Macy <[email protected]> Closes #10471
* Add convenience wrappers for common uio usageJorgen Lundman2020-06-141-0/+33
| | | | | | | | | The macOS uio struct is opaque and the API must be used, this makes the smallest changes to the code for all platforms. Reviewed-by: Matt Macy <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Jorgen Lundman <[email protected]> Closes #10412
* Fix typosAndrea Gelmini2020-06-091-1/+1
| | | | | | | | | Correct various typos in the comments and tests. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Matthew Ahrens <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Andrea Gelmini <[email protected]> Closes #10423
* Move GFP flags kernel compatibility codeMichael Niewöhner2020-06-081-0/+12
| | | | | | | Move the GFP flags kernel compat code from c file to kmem header. Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Michael Niewöhner <[email protected]> Closes #10424
* Linux 5.8 compat: __vmalloc()Michael Niewöhner2020-06-081-0/+9
| | | | | | | | | | | | | | | The `pgprot` argument has been removed from `__vmalloc` in Linux 5.8, being `PAGE_KERNEL` always now [1]. Detect this during configure and define a wrapper for older kernels. [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/mm/vmalloc.c?h=next-20200605&id=88dca4ca5a93d2c09e5bbc6a62fbfc3af83c4fca Reviewed-by: Brian Behlendorf <[email protected]> Co-authored-by: Sebastian Gottschall <[email protected]> Co-authored-by: Michael Niewöhner <[email protected]> Signed-off-by: Sebastian Gottschall <[email protected]> Signed-off-by: Michael Niewöhner <[email protected]> Closes #10422
* Correctly handle the x32 ABIнаб2020-05-281-1/+5
| | | | | | | | | | __x86_64__ && _ILP32 => don't forcibly define _LP64 Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Signed-off-by: Ahelenia Ziemiańska <[email protected]> Closes #10357 Closes #844
* Fix zfs send progress reportingMatthew Ahrens2020-04-201-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | The progress of a send is supposed to be reported by `zfs send -v`, but it is not. This works by creating a new user thread (with pthread_create()) which does ZFS_IOC_SEND_PROGRESS ioctls to check how much progress has been made. This IOCTL finds the specified send (since there may be multiple concurrent sends in the system). The IOCTL also checks that the specified send was started by the current process. On Linux, different threads of the same process are represented as different `struct task_struct`s (and, confusingly, have different PID's). To check if if two threads are in the same process, we need to check if they have the same `struct task_struct:group_leader`. We used to to this correctly, but it was inadvertently changed by 30af21b02569 (Redacted Send) to simply check if the current `struct task_struct` is the one that started the send. This commit changes the code back to checking if the send was started by a `struct task_struct` with the same `group_leader` as the calling thread. Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Chris Wedgwood <[email protected]> Reviewed-by: Paul Dagnelie <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matthew Ahrens <[email protected]> Closes #10215 Closes #10216
* Improve performance of zio_taskq_memberMatthew Ahrens2020-03-031-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | __zio_execute() calls zio_taskq_member() to determine if we are running in a zio interrupt taskq, in which case we may need to switch to processing this zio in a zio issue taskq. The call to zio_taskq_member() can become a performance bottleneck when we are processing a high rate of zio's. zio_taskq_member() calls taskq_member() on each of the zio interrupt taskqs, of which there are 21. This is slow because each call to taskq_member() does tsd_get(taskq_tsd), which on Linux is relatively slow. This commit improves the performance of zio_taskq_member() by having it cache the value of tsd_get(taskq_tsd), reducing the number of those calls to 1/21th of the current behavior. In a test case running `zfs send -c >/dev/null` of a filesystem with small blocks (average 2.5KB/block), zio_taskq_member() was using 6.7% of one CPU, and with this change it is reduced to 1.3%. Overall time to perform the `zfs send` reduced by 10% (~150,000 block/sec to ~165,000 blocks/sec). Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Serapheim Dimitropoulos <[email protected]> Reviewed-by: Ryan Moeller <[email protected]> Reviewed-by: Tony Nguyen <[email protected]> Signed-off-by: Matthew Ahrens <[email protected]> Closes #10070
* Linux 5.6 compat: time_tBrian Behlendorf2020-02-271-1/+1
| | | | | | | | | | | | | | | | | | | As part of the Linux kernel's y2038 changes the time_t type has been fully retired. Callers are now required to use the time64_t type. Rather than move to the new type, I've removed the few remaining places where a time_t is used in the kernel code. They've been replaced with a uint64_t which is already how ZFS internally handled these values. Going forward we should work towards updating the remaining user space time_t consumers to the 64-bit interfaces. Reviewed-by: Matthew Macy <[email protected]> Reviewed-by: Tony Hutter <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #10052 Closes #10064
* Linux 5.6 compat: ktime_get_raw_ts64()Brian Behlendorf2020-02-271-0/+5
| | | | | | | | | | | The getrawmonotonic() and getrawmonotonic64() interfaces have been fully retired. Update gethrtime() to use the replacement interface ktime_get_raw_ts64() which was introduced in the 4.18 kernel. Reviewed-by: Tony Hutter <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #10052 Closes #10064
* Linux 5.6 compat: struct proc_opsBrian Behlendorf2020-02-071-1/+7
| | | | | | | | | | | | | | The proc_ops structure was introduced to replace the use of of the file_operations structure when registering proc handlers. This change creates a new kstat_proc_op_t typedef for compatibility which can be used to pass around the correct structure. This change additionally adds the 'const' keyword to all of the existing proc operations structures. Reviewed-by: Tony Hutter <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #9961
* Remove stale ASSERTV commentMatthew Macy2019-12-061-1/+0
| | | | | | | | | | Followup for #9671, remove stale comment. Reviewed-by: Kjeld Schouten <[email protected]> Reviewed-by: Jorgen Lundman <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matt Macy <[email protected]> Issue #9671 Closes #9682
* Replace ASSERTV macro with compiler annotationMatthew Macy2019-12-051-2/+4
| | | | | | | | | | | Remove the ASSERTV macro and handle suppressing unused compiler warnings for variables only in ASSERTs using the __attribute__((unused)) compiler annotation. The annotation is understood by both gcc and clang. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Jorgen Lundman <[email protected]> Signed-off-by: Matt Macy <[email protected]> Closes #9671
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