diff options
| author | Matthew Ahrens <[email protected]> | 2018-05-31 10:29:12 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2018-06-13 11:05:06 -0700 |
| commit | 1fac63e56f370f675b23687ee2e634744c54e818 (patch) | |
| tree | 1655183ce851b290e08c0d191ac01aeb87e2caf1 /include/sys/dbuf.h | |
| parent | 232dd8b956703bcc774524e78110d13de93dd5bd (diff) | |
OpenZFS 9577 - remove zfs_dbuf_evict_key tsd
The zfs_dbuf_evict_key TSD (thread-specific data) is not necessary -
we can instead pass a flag down in a few places to prevent recursive
dbuf eviction. Making this change has 3 benefits:
1. The code semantics are easier to understand.
2. On Linux, performance is improved, because creating/removing
TSD values (by setting to NULL vs non-NULL) is expensive, and
we do it very often.
3. According to Nexenta, the current semantics can cause a
deadlock when concurrently calling dmu_objset_evict_dbufs()
(which is rare today, but they are working on a "parallel
unmount" change that triggers this more easily):
Porting Notes:
* Minor conflict with OpenZFS 9337 which has not yet been ported.
Authored by: Matthew Ahrens <[email protected]>
Reviewed by: George Wilson <[email protected]>
Reviewed by: Serapheim Dimitropoulos <[email protected]>
Reviewed by: Brad Lewis <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Ported-by: Brian Behlendorf <[email protected]>
OpenZFS-issue: https://illumos.org/issues/9577
OpenZFS-commit: https://github.com/openzfs/openzfs/pull/645
External-issue: DLPX-58547
Closes #7602
Diffstat (limited to 'include/sys/dbuf.h')
| -rw-r--r-- | include/sys/dbuf.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/sys/dbuf.h b/include/sys/dbuf.h index ddce7deef..16dc61e7f 100644 --- a/include/sys/dbuf.h +++ b/include/sys/dbuf.h @@ -20,7 +20,7 @@ */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2012, 2015 by Delphix. All rights reserved. + * Copyright (c) 2012, 2018 by Delphix. All rights reserved. * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. */ @@ -305,7 +305,7 @@ boolean_t dbuf_try_add_ref(dmu_buf_t *db, objset_t *os, uint64_t obj, uint64_t dbuf_refcount(dmu_buf_impl_t *db); void dbuf_rele(dmu_buf_impl_t *db, void *tag); -void dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag); +void dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag, boolean_t evicting); dmu_buf_impl_t *dbuf_find(struct objset *os, uint64_t object, uint8_t level, uint64_t blkid); |