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zfs: convert z_teardown_inactive_lock to sleepable read-mostly lock

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This eliminates a global serialisation point. It only gets write locked
on unmount.

Sample result doing an incremental -j 40 build:
before: 173.30s user 458.97s system 2595% cpu 24.358 total
after:  168.58s user 254.92s system 2211% cpu 19.147 total
This commit is contained in:
Mateusz Guzik 2020-01-31 08:38:38 +00:00
parent b076e113af
commit 8c3658c450
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357322
2 changed files with 10 additions and 9 deletions
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15
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h
View File

@ -33,6 +33,7 @@
#include <sys/sa.h>
#include <sys/rrwlock.h>
#include <sys/zfs_ioctl.h>
#include <sys/rmlock.h>
#ifdef __cplusplus
extern "C" {
@ -65,7 +66,7 @@ struct zfsvfs {
boolean_t z_atime; /* enable atimes mount option */
boolean_t z_unmounted; /* unmounted */
rrmlock_t z_teardown_lock;
krwlock_t z_teardown_inactive_lock;
struct rmslock z_teardown_inactive_lock;
list_t z_all_znodes; /* all vnodes in the fs */
kmutex_t z_znodes_lock; /* lock for z_all_znodes */
struct zfsctl_root *z_ctldir; /* .zfs directory pointer */
@ -91,22 +92,22 @@ struct zfsvfs {
};
#define ZFS_TRYRLOCK_TEARDOWN_INACTIVE(zfsvfs) \
rw_tryenter(&(zfsvfs)->z_teardown_inactive_lock, RW_READER)
rms_try_rlock(&(zfsvfs)->z_teardown_inactive_lock)
#define ZFS_RLOCK_TEARDOWN_INACTIVE(zfsvfs) \
rw_enter(&(zfsvfs)->z_teardown_inactive_lock, RW_READER)
rms_rlock(&(zfsvfs)->z_teardown_inactive_lock)
#define ZFS_RUNLOCK_TEARDOWN_INACTIVE(zfsvfs) \
rw_exit(&(zfsvfs)->z_teardown_inactive_lock)
rms_runlock(&(zfsvfs)->z_teardown_inactive_lock)
#define ZFS_WLOCK_TEARDOWN_INACTIVE(zfsvfs) \
rw_enter(&(zfsvfs)->z_teardown_inactive_lock, RW_WRITER)
rms_wlock(&(zfsvfs)->z_teardown_inactive_lock)
#define ZFS_WUNLOCK_TEARDOWN_INACTIVE(zfsvfs) \
rw_exit(&(zfsvfs)->z_teardown_inactive_lock)
rms_wunlock(&(zfsvfs)->z_teardown_inactive_lock)
#define ZFS_WLOCK_TEARDOWN_INACTIVE_WLOCKED(zfsvfs) \
RW_WRITE_HELD(&(zfsvfs)->z_teardown_inactive_lock)
rms_wowned(&(zfsvfs)->z_teardown_inactive_lock)
/*
* Normal filesystems (those not under .zfs/snapshot) have a total

4
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
View File

@ -1205,7 +1205,7 @@ zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os)
#else
rrm_init(&zfsvfs->z_teardown_lock, B_FALSE);
#endif
rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL);
rms_init(&zfsvfs->z_teardown_inactive_lock, "zfs teardown inactive");
rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL);
for (int i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
@ -1322,7 +1322,7 @@ zfsvfs_free(zfsvfs_t *zfsvfs)
mutex_destroy(&zfsvfs->z_lock);
list_destroy(&zfsvfs->z_all_znodes);
rrm_destroy(&zfsvfs->z_teardown_lock);
rw_destroy(&zfsvfs->z_teardown_inactive_lock);
rms_destroy(&zfsvfs->z_teardown_inactive_lock);
rw_destroy(&zfsvfs->z_fuid_lock);
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_destroy(&zfsvfs->z_hold_mtx[i]);