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FreeBSD: convert teardown inactive lock to a read-mostly sleepable lock

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The lock is taken all the time and as a regular read-write lock
avoidably serves as a mount point-wide contention point.

This forward ports FreeBSD revision r357322.

To quote aforementioned commit:

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

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Ryan Moeller <freqlabs@FreeBSD.org>
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Closes #10896
This commit is contained in:
Mateusz Guzik
2020-09-09 19:15:52 +02:00
committed by Brian Behlendorf
parent 17e2fd3bfd
commit 29bc31f62f
4 changed files with 82 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/os/freebsd/zfs/zfs_vnops.c
+8 -8
View File
@@ -4638,13 +4638,13 @@ zfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct)
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
int error;
rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER);
ZFS_RLOCK_TEARDOWN_INACTIVE(zfsvfs);
if (zp->z_sa_hdl == NULL) {
/*
* The fs has been unmounted, or we did a
* suspend/resume and this file no longer exists.
*/
rw_exit(&zfsvfs->z_teardown_inactive_lock);
ZFS_RUNLOCK_TEARDOWN_INACTIVE(zfsvfs);
vrecycle(vp);
return;
}
@@ -4653,7 +4653,7 @@ zfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct)
/*
* Fast path to recycle a vnode of a removed file.
*/
rw_exit(&zfsvfs->z_teardown_inactive_lock);
ZFS_RUNLOCK_TEARDOWN_INACTIVE(zfsvfs);
vrecycle(vp);
return;
}
@@ -4673,7 +4673,7 @@ zfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct)
dmu_tx_commit(tx);
}
}
rw_exit(&zfsvfs->z_teardown_inactive_lock);
ZFS_RUNLOCK_TEARDOWN_INACTIVE(zfsvfs);
}
@@ -5823,10 +5823,10 @@ zfs_freebsd_need_inactive(struct vop_need_inactive_args *ap)
if (vn_need_pageq_flush(vp))
return (1);
if (!rw_tryenter(&zfsvfs->z_teardown_inactive_lock, RW_READER))
if (!ZFS_TRYRLOCK_TEARDOWN_INACTIVE(zfsvfs))
return (1);
need = (zp->z_sa_hdl == NULL || zp->z_unlinked || zp->z_atime_dirty);
rw_exit(&zfsvfs->z_teardown_inactive_lock);
ZFS_RUNLOCK_TEARDOWN_INACTIVE(zfsvfs);
return (need);
}
@@ -5857,12 +5857,12 @@ zfs_freebsd_reclaim(struct vop_reclaim_args *ap)
* zfs_znode_dmu_fini in zfsvfs_teardown during
* force unmount.
*/
rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER);
ZFS_RLOCK_TEARDOWN_INACTIVE(zfsvfs);
if (zp->z_sa_hdl == NULL)
zfs_znode_free(zp);
else
zfs_zinactive(zp);
rw_exit(&zfsvfs->z_teardown_inactive_lock);
ZFS_RUNLOCK_TEARDOWN_INACTIVE(zfsvfs);
vp->v_data = NULL;
return (0);