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| author | kib <kib@FreeBSD.org> | 2008-03-23 13:45:24 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2008-03-23 13:45:24 +0000 |
| commit | 5ddf5664ccd9a5fa53eda81e8ec89445bfaf3c41 (patch) | |
| tree | 72ecaa475ca0981f6c6e503a2d9814052b1078e5 /sys/kern/vfs_mount.c | |
| parent | 5e55dd67176633e7adc6e3726f22960f15941c9a (diff) | |
| download | FreeBSD-src-5ddf5664ccd9a5fa53eda81e8ec89445bfaf3c41.zip FreeBSD-src-5ddf5664ccd9a5fa53eda81e8ec89445bfaf3c41.tar.gz | |
Yield the cpu in the kernel while iterating the list of the
vnodes belonging to the mountpoint. Also, yield when in the
softdep_process_worklist() even when we are not going to sleep due to
buffer drain.
It is believed that the ULE fixed the problem [1], but the yielding
seems to be needed at least for the 4BSD case.
Discussed: on stable@, with bde
Reviewed by: tegge, jeff [1]
MFC after: 2 weeks
Diffstat (limited to 'sys/kern/vfs_mount.c')
| -rw-r--r-- | sys/kern/vfs_mount.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c index 0f829a9..3961022 100644 --- a/sys/kern/vfs_mount.c +++ b/sys/kern/vfs_mount.c @@ -2008,6 +2008,12 @@ __mnt_vnode_next(struct vnode **mvp, struct mount *mp) mtx_assert(MNT_MTX(mp), MA_OWNED); KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); + if ((*mvp)->v_yield++ == 500) { + MNT_IUNLOCK(mp); + (*mvp)->v_yield = 0; + uio_yield(); + MNT_ILOCK(mp); + } vp = TAILQ_NEXT(*mvp, v_nmntvnodes); while (vp != NULL && vp->v_type == VMARKER) vp = TAILQ_NEXT(vp, v_nmntvnodes); |
