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* Add support for s390[x].Dimitri John Ledkov2016-03-171-1/+15
| | | | | | | Signed-off-by: Dimitri John Ledkov <[email protected]> Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #537
* Allow spawning a new thread for TQ_NOQUEUE dispatch with dynamic taskqTim Chase2016-03-171-4/+18
| | | | | | | | | | | | When a TQ_NOQUEUE dispatch is done on a dynamic taskq, allow another thread to be spawned. This will cause TQ_NOQUEUE to behave similarly as it does with non-dynamic taskqs. Add support for TQ_NOQUEUE to taskq_dispatch_ent(). Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #530
* Add rw_tryupgrade()Brian Behlendorf2016-03-103-100/+16
| | | | | | | | | | | | | | | | | | | | This implementation of rw_tryupgrade() behaves slightly differently from its counterparts on other platforms. It drops the RW_READER lock and then acquires the RW_WRITER lock leaving a small window where no lock is held. On other platforms the lock is never released during the upgrade process. This is necessary under Linux because the kernel does not provide an upgrade function. There are currently no callers in the ZFS code where this change in behavior is a problem. In fact, in most cases the code is already written such that if the upgrade fails the RW_READER lock is dropped and the caller blocks waiting to acquire the lock as RW_WRITER. Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Matthew Thode <[email protected]> Closes zfsonlinux/zfs#4388 Closes #534
* Remove RPM package restrictionBrian Behlendorf2016-03-101-5/+0
| | | | | | | | ZFS on Linux is regularly tested on arm, ppc, ppc64, i686 and x86_64 architectures. Given this the artificial architecture restriction in the packaging has been removed. Signed-off-by: Brian Behlendorf <[email protected]>
* Changes to support zfs encryptionTom Caputi2016-02-252-19/+23
| | | | | | | | Unused modlinkage struct removed and ntohll functions added. Signed-off-by: Tom Caputi <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #533
* random_get_pseudo_bytes() need not provide cryptographic strength entropyRichard Yao2016-02-172-6/+149
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Perf profiling of dd on a zvol revealed that my system spent 3.16% of its time in random_get_pseudo_bytes(). No SPL consumers need cryptographic strength entropy, so we can reduce our overhead by changing the implementation to utilize a fast PRNG. The Linux kernel did not export a suitable PRNG function until it exported get_random_int() in Linux 3.10. While we could implement an autotools check so that we use it when it is available or even try to access the symbol on older kernels where it is not exported using the fact that it is exported on newer ones as justification, we can instead implement our own pseudo-random data generator. For this purpose, I have written one based on a 128-bit pseudo-random number generator proposed in a paper by Sebastiano Vigna that itself was based on work by the late George Marsaglia. http://vigna.di.unimi.it/ftp/papers/xorshiftplus.pdf Profiling the same benchmark with an earlier variant of this patch that used a slightly different generator (roughly same number of instructions) by the same author showed that time spent in random_get_pseudo_bytes() dropped to 0.06%. That is a factor of 50 improvement. This particular generator algorithm is also well known to be fast: http://xorshift.di.unimi.it/#speed The benchmark numbers there state that it runs at 1.12ns/64-bits or 7.14 GBps of throughput on an Intel Core i7-4770 in what is presumably a single-threaded context. Using it in `random_get_pseudo_bytes()` in the manner I have will probably not reach that level of performance, but it should be fairly high and many times higher than the Linux `get_random_bytes()` function that we use now, which runs at 16.3 MB/s on my Intel Xeon E3-1276v3 processor when measured by using dd on /dev/urandom. Also, putting this generator's seed into per-CPU variables allows us to eliminate overhead from both spin locks and CPU memory barriers, which is NUMA friendly. We could have alternatively modified consumers to use something like `gethrtime() % 3` as suggested by both Matthew Ahrens and Tim Chase, but that has a few potential problems that this approach avoids: 1. Switching to `gethrtime() % 3` in hot code paths today requires diverging from illumos-gate and does nothing about potential future patches from illumos-gate that call our slow `random_get_pseudo_bytes()` in different hot code paths. Reimplementing `random_get_pseudo_bytes()` with a per-CPU PRNG avoids both of those things entirely, which means less work for us in the future. 2. Looking at the code that implements `gethrtime()`, I think it is unlikely to be faster than this per-CPU PRNG implementation of `random_get_pseudo_bytes()`. It would be best to go with something fast now so that there is no point in revisiting this from a performance perspective. 3. `gethrtime() % 3` can vary in behavior from system to system based on kernel version, architecture and clock source. In comparison, this per-CPU PRNG is about ~40 lines of code in `random_get_pseudo_bytes()` that should behave consistently across all systems regardless of kernel version, system architecture or machine clock source. It is unlikely that we would ever need to revisit this per-CPU PRNG while the same cannot be said for `gethrtime() % 3`. 4. `gethrtime()` uses CPU memory barriers and maybe atomic instructions depending on the clock source, so replacing `random_get_pseudo_bytes()` with `gethrtime()` in hot code paths could still require a future person working on NUMA scalability to reimplement it anyway while this per-CPU PRNG would not by virtue of using neither CPU memory barriers nor atomic instructions. Note that I did not check various clock sources for the presence of atomic instructions. There is simply too much code to read and given the drawbacks versus this per-cpu PRNG, there is no point in being certain. 5. I have heard of instances where poor quality pseudo-random numbers caused problems for HPC code in ways that took more than a year to identify and were remedied by switching to a higher quality source of pseudo-random numbers. While filesystems are different than HPC code, I do not think it is impossible for us to have instances where poor quality pseudo-random numbers can cause problems. Opting for a well studied PRNG algorithm that passes tests for statistical randomness over changing callers to use `gethrtime() % 3` bypasses the need to think about both whether poor quality pseudo-random numbers can cause problems and the statistical quality of numbers from `gethrtime() % 3`. 6. `gethrtime()` calls `getrawmonotonic()`, which uses seqlocks. This is probably not a huge issue, but anyone using kgdb would never be able to step through a seqlock critical section, which is not a problem either now or with the per-CPU PRNG: https://en.wikipedia.org/wiki/Seqlock The only downside that I can see is that this code's memory requirement is O(N) where N is NR_CPUS, versus the current code and `gethrtime() % 3`, which are O(1), but that should not be a problem. The seeds will use 64KB of memory at the high end (i.e `NR_CPU == 4096`) and 16 bytes of memory at the low end (i.e. `NR_CPU == 1`). In either case, we should only use a few hundred bytes of code for text, especially since `spl_rand_jump()` should be inlined into `spl_random_init()`, which should be removed during early boot as part of "Freeing unused kernel memory". In either case, the memory requirements are minuscule. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Tim Chase <[email protected]> Closes #372
* Allow kicking a taskq to spawn more threadsChunwei Chen2016-02-053-0/+75
| | | | | | | | | | | This patch add a module parameter spl_taskq_kick. When writing non-zero value to it, it will scan all the taskq, if a taskq contains a task pending for more than 5 seconds, it will be forced to spawn a new thread. This is use as an emergency recovery from deadlock, not a general solution. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #529
* Ensure spl/ only occurs once in core-yChip Parker2016-01-261-1/+1
| | | | | | | | | | Update copy-builtin so it may be run multiple times against the kernel source tree. This change makes sed more discriminating to ensure spl/ only occurs once in core-y. Signed-off-by: Chip Parker <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #526
* Remove RLIM64_INFINITY assert in vn_rdwr()Brian Behlendorf2016-01-231-1/+0
| | | | | | | | | Previous commit be29e6a updated kobj_read_file() so it no longer unconditionally passes RLIM64_INFINITY. The vn_rdwr() function needs to be updated accordingly. Signed-off-by: Brian Behlendorf <[email protected]> Issue #513
* kobj_read_file: Return -1 on vn_rdwr() errorRichard Yao2016-01-232-5/+10
| | | | | | | | | | | | | I noticed that the SPL implementation of kobj_read_file is not correct after comparing it with the userland implementation of kobj_read_file() in zfsonlinux/zfs#4104. Note that we no longer pass RLIM64_INFINITY with this, but our vn_rdwr implementation did not support it anyway, so there is no difference. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #513
* Create spl-kmod-debuginfo rpm with redhat spec fileOlaf Faaland2016-01-212-1/+4
| | | | | | | | | | Correct the redhat specfile so that working debuginfo rpms are created for the kernel modules. The generic specfile already does the right thing. Signed-off-by: Olaf Faaland <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes zfsonlinux/zfs#4224
* Use tsd to store tq for taskq_memberChunwei Chen2016-01-205-57/+63
| | | | | | | | | | | | | To prevent taskq_member holding tq_lock and doing linear search, thus causing contention. We store the taskq pointer to which the thread belongs in tsd. This way taskq_member will not need to touch tq_lock, and tsd has per slot spinlock. So the contention should be reduced greatly. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #500 Closes #504 Closes #505
* Linux 4.5 compat: pfn_t typedefBrian Behlendorf2016-01-201-1/+0
| | | | | | | | | | | | | The pfn_t typedef was inherited from Illumos but never directly used by any SPL consumers. This didn't cause any issues until the Linux 4.5 kernel introduced a typedef of the same name. See torvalds/linux/commit/34c0fd54, this patch removes the unused Illumos version to prevent a conflict. Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Chunwei Chen <[email protected]> Closes #524
* Turn on both PF_FSTRANS and PF_MEMALLOC_NOIO in spl_fstrans_markChunwei Chen2016-01-201-4/+10
| | | | | | | | | | | | In b4ad50a, we abandoned memalloc_noio_save in favor of spl_fstrans_mark because earlier kernel with it doesn't turn off __GFP_FS. However, for newer kernel, we would prefer PF_MEMALLOC_NOIO because it would work for allocation in kernel which we cannot control otherwise. So in this patch, we turn on both PF_FSTRANS and PF_MEMALLOC_NOIO in spl_fstrans_mark. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #523
* Don't hold mutex until release cv in cv_waitChunwei Chen2016-01-122-15/+70
| | | | | | | | | | | | | | | | | | | | | | | | If a thread is holding mutex when doing cv_destroy, it might end up waiting a thread in cv_wait. The waiter would wake up trying to aquire the same mutex and cause deadlock. We solve this by move the mutex_enter to the bottom of cv_wait, so that the waiter will release the cv first, allowing cv_destroy to succeed and have a chance to free the mutex. This would create race condition on the cv_mutex. We use xchg to set and check it to ensure we won't be harmed by the race. This would result in the cv_mutex debugging becomes best-effort. Also, the change reveals a race, which was unlikely before, where we call mutex_destroy while test threads are still holding the mutex. We use kthread_stop to make sure the threads are exit before mutex_destroy. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Tim Chase <[email protected]> Issue zfsonlinux/zfs#4166 Issue zfsonlinux/zfs#4106
* Add spl_kmem_cache_kmem_threads man page entryBrian Behlendorf2016-01-121-0/+14
| | | | | | | | The spl_kmem_cache_kmem_threads module option was accidentally omitted from the documentation. Add it. Signed-off-by: Brian Behlendorf <[email protected]> Closes #512
* _ILP32 is always defined on SPARCAlex McWhirter2016-01-081-4/+0
| | | | | | Signed-off-by: Alex McWhirter <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #520
* Fix do_div() types in condvar:timeoutBrian Behlendorf2015-12-221-5/+6
| | | | | | | | The do_div() macro expects unsigned types and this is detected in powerpc implementation of do_div(). Signed-off-by: Brian Behlendorf <[email protected]> Closes #516
* Use spl_fstrans_mark instead of memalloc_noio_saveChunwei Chen2015-12-185-38/+5
| | | | | | | | | | | | | | | | | | | For earlier versions of the kernel with memalloc_noio_save, it only turns off __GFP_IO but leaves __GFP_FS untouched during direct reclaim. This would cause threads to direct reclaim into ZFS and cause deadlock. Instead, we should stick to using spl_fstrans_mark. Since we would explicitly turn off both __GFP_IO and __GFP_FS before allocation, it will work on every version of the kernel. This impacts kernel versions 3.9-3.17, see upstream kernel commit torvalds/linux@934f307 for reference. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Tim Chase <[email protected]> Closes #515 Issue zfsonlinux/zfs#4111
* Provide kstat for taskqsTim Chase2015-12-163-7/+283
| | | | | | | | | | | | | | | | | | | | | | | | | | | This patch provides 2 new kstats to display task queues: /proc/spl/taskqs-all - Display all task queues /proc/spl/taskqs - Display only "active" task queues A task queue is considered to be "active" if it currently has active (running) threads or if any of its pending, priority, delay or waitq lists are not empty. If the task queue has running threads, displays each thread function's address (symbolically, if possibly) and its argument. If the task queue has a non-empty list of pending, priority or delayed task queue entries (taskq_ent_t), displays each entry's thread function address and arguemnt. If the task queue has any waiters, displays each waiting task's pid. Note: This patch also updates some comments in taskq.h which referred to "taskq_t" when they should have referred to "taskq_ent_t". Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #491
* Skip GPL-only symbols test when cross-compilingKamil Domanski2015-12-141-8/+11
| | | | | | | Signed-off-by: Kamil Domański <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes zfsonlinux/spl#507 Closes zfsonlinux/zfs#4075
* Revert "Skip GPL-only symbols test when cross-compiling"Brian Behlendorf2015-12-111-1/+0
| | | | | | | | | This reverts commit 61bbbd9a775a5517af513e5014edbdd73a32f7e4 because older versions of autoconf (2.63) do not support the cross-compile argument to AC_RUN_IFELSE. Signed-off-by: Brian Behlendorf <[email protected]> Issue #507
* Fix cstyle issues in spl-taskq.c and taskq.hBrian Behlendorf2015-12-112-79/+87
| | | | | | | This patch only addresses the issues identified by the style checker. It contains no functional changes. Signed-off-by: Brian Behlendorf <[email protected]>
* Don't use tq->tq_lock_flagsChunwei Chen2015-12-112-62/+62
| | | | | | | | | | The flags argument in spin_lock_irqsave is modified out side of spin_lock context. We cannot use a shared variable like tq->tq_lock_flags for them. This patch removes it and uses local variable for the flags. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #506
* Subclass tq_lock to eliminate a lockdep warningOlaf Faaland2015-12-112-21/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | When taskq_dispatch() calls taskq_thread_spawn() to create a new thread for a taskq, linux lockdep warns of possible recursive locking. This is a false positive. One such call chain is as follows, when a taskq needs more threads: taskq_dispatch->taskq_thread_spawn->taskq_dispatch The initial taskq_dispatch() holds tq_lock on the taskq that needed more worker threads. The later call into taskq_dispatch() takes dynamic_taskq->tq_lock. Without subclassing, lockdep believes these could potentially be the same lock and complains. A similar case occurs when taskq_dispatch() then calls task_alloc(). This patch uses spin_lock_irqsave_nested() when taking tq_lock, with one of two new lock subclasses: subclass taskq TQ_LOCK_DYNAMIC dynamic_taskq TQ_LOCK_GENERAL any other Signed-off-by: Olaf Faaland <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #480
* Fix lockdep warning in spl_inode_{lock,unlock}Olaf Faaland2015-12-111-1/+1
| | | | | | | | | | | | | | | | spl_inode_{lock,unlock} are triggering possible recursive locking warnings from lockdep. The warning is a false positive. The lock is used to protect a parent directory during delete/add operations, used in zfs when writing/removing the cache file. The inode lock is taken on both the parent inode and the file inode. VFS provides an enum to subclass the lock. This patch changes the spin_lock call to _nested version and uses the provided enum. Signed-off-by: Olaf Faaland <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #480
* Add new lock types MUTEX_NOLOCKDEP, and RW_NOLOCKDEPOlaf Faaland2015-12-112-3/+81
| | | | | | | | | | | | | | | | | | | | | | | | | When running a kernel with CONFIG_LOCKDEP=y, lockdep reports possible recursive locking in some cases and possible circular locking dependency in others, within the SPL and ZFS modules. When lockdep detects these conditions, it disables further lock analysis for all locks. This causes /proc/lock_stats not to reflect full information about lock contention, even in locks without dependency issues. This commit creates a new type of mutex, MUTEX_NOLOCKDEP. This mutex type causes subsequent attempts to take or release those locks to be wrapped in lockdep_off() and lockdep_on(). This commit also creates an RW_NOLOCKDEP type analagous to MUTEX_NOLOCKDEP. MUTEX_NOLOCKDEP and RW_NOLOCKDEP are also defined in zfs, in a commit to that repo, for userspace builds. Signed-off-by: Olaf Faaland <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #480
* Skip GPL-only symbols test when cross-compilingKamil Domański2015-12-111-0/+1
| | | | | | | | | | | | | | | This test depends on being able to execute the resulting binary which will be impossible when cross-compiling. Instead make a worst case assumption which allows the build to continue as recommended by the autoconf manual. https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Runtime.html Signed-off-by: Kamil Domański <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: tuxoko <[email protected]> Closes zfsonlinux/spl#507 Closes zfsonlinux/zfs#4075
* Fix build issue on some configured kernelszgock2015-12-111-1/+1
| | | | | | | | | | The SPL fails to build with some "Configured" kernels (ex. openSUSE xen Kernel) this change should make same binaries with C compiler optimization. Signed-off-by: zgock <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #510
* Either _ILP32 or _LP64 must be definedBrian Behlendorf2015-12-101-11/+31
| | | | | | | | | | | For some arm, powerpc, and sparc platforms it was possible that neither _ILP32 of _LP64 would be defined. Update the isa_defs.h header to explicitly set these macros and generate a compile error in the case neither are defined. Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: tuxoko <[email protected]> Issue zfsonlinux/zfs#4048
* Revert "Make taskq_member() use ->journal_info"Brian Behlendorf2015-12-082-4/+35
| | | | | | | | This reverts commit a430c11f0b1ef16ca5edf3059e4082709277376c. Using journal_info like this can cause a BUG at kernel fs/jbd2/transaction.c:425! Signed-off-by: Brian Behlendorf <[email protected]> Issue #500
* Make taskq_member() use ->journal_infoRichard Yao2015-12-082-35/+4
| | | | | | | | | | | | | | | | | | | | | | The ->journal_info pointer in the task_struct is reserved for use by filesystems and because the kernel can have multiple file systems on the same stack due to direct reclaim, each filesystem that touches ->journal_info in a callback function will save the value at the start of its frame and restore it at the end of its frame. This allows us to safely use ->journal_info to store a pointer to the taskq's struct in taskq threads so that ZFS code paths can detect the presence of a taskq. This could break if the ZFS code were to use taskq_member from the context of direct reclaim. However, there are no such uses of it in that manner, so this is safe. This eliminates an O(N) list traversal under a spinlock with an O(1) unlocked pointer comparison. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: tuxoko <[email protected]> Signed-off-by: Tim Chase <[email protected]> Closes #500
* Fix race between getf() and areleasef()Richard Yao2015-12-032-2/+15
| | | | | | | | | | | | | | | | | | If a vnode is released asynchronously through areleasef(), it is possible for the user process to reuse the file descriptor before areleasef is called. When this happens, getf() will return a stale reference, any operations in the kernel on that file descriptor will fail (as it is closed) and the operations meant for that fd will never occur from userspace's perspective. We correct this by detecting this condition in getf(), doing a putf on the old file handle, updating the file descriptor and proceeding as if everything was fine. When the areleasef() is done, it will harmlessly decrement the reference counter on the Illumos file handle. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #492
* Prevent rm modules.* when make installtuxoko2015-12-021-1/+1
| | | | | | | | | | | This was originally in e80cd06b8e0428f3ca2c62e4cb0e4ec54fda1d5c, but somehow was changed and not working anymore. And it will cause the following error: modprobe: ERROR: ../libkmod/libkmod.c:506 lookup_builtin_file() could not open builtin file '/lib/modules/4.2.0-18-generic/modules.builtin.bin' Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #501
* Add a script to display SPL slab cache statisticsBoris Protopopov2015-12-028-11/+219
| | | | | | | | Useful when looking for the info on ZFS/SPL related memory consumption. Signed-off-by: Boris Protopopov <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #460
* Additional dkio support for TRIM/DiscardTim Chase2015-12-023-8/+65
| | | | | | | | | Replace DKIOCTRIM with DKIOCFREE and add additional support required for Nextenta's TRIM support. Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #469
* spl-kmem-cache: include linux/prefetch.h for prefetchw()Dimitri John Ledkov2015-12-021-0/+1
| | | | | | | | This is needed for architectures that do not have a builtin prefetchw() Signed-off-by: Dimitri John Ledkov <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #502
* Fix --enable-linux-builtinBrian Behlendorf2015-12-021-2/+5
| | | | | | | | | | | | | | Adding VPATH support, commit 37d7cd9, required that a `src` and `obj` line be added to the top of the Makefiles. They must be removed from the Makefiles when builtin. The code which adds the `spl/` directory to the top level Makefile was failing due to the addition of the `certs/` path. The search pattern has been adjusted to be more tolerant. Signed-off-by: Brian Behlendorf <[email protected]> Issue #481 Issue #498
* Limit maximum object size in kmem testsBrian Behlendorf2015-11-161-1/+4
| | | | | | | | | | Limit the maximum object size to 1/128 of total system memory for the kmem cache tests. Large values can result in out of memory errors for systems with less the 512M of memory. Additionally, use the known number of objects per-slab for calculating the number of objects to use for a test. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove superfluous `newline` characterloli10K2015-11-131-1/+1
| | | | | | | | | Remove superfluous `newline` character from spl_kmem_cache_magazine_size module parameter description. Signed-off-by: loli10K <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #499
* sysmacros: Make P2ROUNDUP not trigger int overflowJason Zaman2015-11-131-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | The original P2ROUNDUP and P2ROUNDUP_TYPED macros contain -x which triggers PaX's integer overflow detection for unsigned integers. Replace the macros with an equivalent version that does not trigger the overflow. Axioms: A. (-(x)) === (~((x) - 1)) === (~(x) + 1) under two's complement. B. ~(x & y) === ((~(x)) | (~(y))) under De Morgan's law. C. ~(~x) === x under the law of excluded middle. Proof: 0. (-(-(x) & -(align))) original 1. (~(-(x) & -(align)) + 1) by A 2. (((~(-(x))) | (~(-(align)))) + 1) by B 3. (((~(~((x) - 1))) | (~(~((align) - 1)))) + 1) by A 4. (((((x) - 1)) | (((align) - 1))) + 1) by C Q.E.D. Signed-off-by: Jason Zaman <[email protected]> Reviewed-by: Chris Dunlop <[email protected]> Reviewed-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes zfsonlinux/zfs#2505 Closes #488
* Fix taskq dynamic spawningtuxoko2015-11-131-14/+11
| | | | | | | | | | | | | | | | | | | | Currently taskq_dispatch() will spawn new task with a condition that the caller is also a member of the taskq. However, under this condition, it will still cause deadlock where a task on tq1 is waiting another thread, who is trying to dispatch a task on tq1. So this patch removes the check. For example when you do: zfs send pp/fs0@001 | zfs recv pp/fs0_copy This will easily deadlock before this patch. Also, move the seq_task check from taskq_thread_spawn() to taskq_thread() because it's not used by the caller from taskq_dispatch(). Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #496
* Don't call kmem_cache_shrink from shrinkerChunwei Chen2015-11-111-6/+1
| | | | | | | | | | | | | Linux slab will automatically free empty slab when number of partial slab is over min_partial, so we don't need to explicitly shrink it. In fact, calling kmem_cache_shrink from shrinker will cause heavy contention on kmem_cache_node->list_lock, to the point that it might cause __slab_free to livelock (see zfsonlinux/zfs#3936) Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes zfsonlinux/zfs#3936 Closes #487
* Fix CPU hotplugBrian Behlendorf2015-10-132-9/+8
| | | | | | | | | | | | | | | | Allocate a kmem cache magazine for every possible CPU which might be added to the system. This ensures that when one of these CPUs is enabled it can be safely used immediately. For many systems the number of online CPUs is identical to the number of present CPUs so this does imply an increased memory footprint. In fact, dynamically allocating the array of magazine pointers instead of using the worst case NR_CPUS can end up decreasing our memory footprint. Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Ned Bass <[email protected]> Closes #482
* Use tab indent in rwlock.hChunwei Chen2015-10-021-73/+73
| | | | | | Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #473
* rwsem use kernel provided owner when possibleChunwei Chen2015-10-021-1/+22
| | | | | | | | | If CONFIG_RWSEM_SPIN_ON_OWNER is defined, rw_semaphore will have an owner field, so we don't need our own. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #473
* Don't take spin lock on rwlock ownerChunwei Chen2015-10-021-19/+4
| | | | | | | | | | | | | | The spin lock around rw_owner is completely unnecessary. The reason is that it is only modified in the down_write context. If you race against another thread modifying it, that means that you aren't holding the rwlock, so taking the spin lock don't eliminate the race. Also, we only check rw_owner in RW_WRITE_HELD because spl_rwsem_is_locked is unnecessary and might need to take spin lock. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #473
* Fix spl-dkms uninstall/updateBrian Behlendorf2015-10-021-5/+6
| | | | | | | | | | | | | Modern versions of dkms cleanup the build directory after installing. This resulted in 'dkms uninstall' never running because the check added by commit 4cdcdbf which verifies the existence of the spl.release build product would never be true. This patch resolves the issue by updating the conditional to check in the explicitly installed spl_config.h file for the version. Signed-off-by: Brian Behlendorf <[email protected]> Closes #478
* Fix PAX Patch/Grsec SLAB_USERCOPY panicBrian Behlendorf2015-09-281-1/+11
| | | | | | | | | | | | | | | Support grsecurity/PaX kernel configurations where CONFIG_PAX_USERCOPY_SLABS are enabled. When this kernel option is enabled slabs which are used to copy between user and kernel space must be created with SLAB_USERCOPY. Stock Linux kernels do not have a SLAB_USERCOPY definition so this causes no change in behavior for non-PAX-enabled kernels. Verified-by: Wuffleton <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #2977 Issue #3796
* Tag spl-0.6.5Brian Behlendorf2015-09-103-1/+7
| | | | | | META file and release log updated. Signed-off-by: Brian Behlendorf <[email protected]>
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