diff options
| author | Brian Foster <bfoster@redhat.com> | 2017-10-17 14:16:29 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-10-26 15:38:23 -0700 |
| commit | 7561d27e90fa0df0aac2a1d6b49c2a28eaae7026 (patch) | |
| tree | 32bd75949c8254c6cf62c393e9fd0d5b3bd789e9 /fs/xfs/xfs_buf.h | |
| parent | a53efbd5c6802e07b64aa767bb932da6913470c8 (diff) | |
| download | linux-7561d27e90fa0df0aac2a1d6b49c2a28eaae7026.tar.bz2 | |
xfs: buffer lru reference count error injection tag
XFS uses a fixed reference count for certain types of buffers in the
internal LRU cache. These reference counts dictate how aggressively
certain buffers are reclaimed vs. others. While the reference counts
implements priority across different buffer types, all buffers
(other than uncached buffers) are typically cached for at least one
reclaim cycle.
We've had at least one bug recently that has been hidden by a
released buffer sitting around in the LRU. Users hitting the problem
were able to reproduce under enough memory pressure to cause
aggressive reclaim in a particular window of time.
To support future xfstests cases, add an error injection tag to
hardcode the buffer reference count to zero. When enabled, this
bypasses caching of associated buffers and facilitates test cases
that depend on this behavior.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs/xfs_buf.h')
| -rw-r--r-- | fs/xfs/xfs_buf.h | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h index bf71507ddb16..f873bb786824 100644 --- a/fs/xfs/xfs_buf.h +++ b/fs/xfs/xfs_buf.h @@ -352,10 +352,7 @@ extern void xfs_buf_terminate(void); #define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn) #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno)) -static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) -{ - atomic_set(&bp->b_lru_ref, lru_ref); -} +void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref); static inline int xfs_buf_ispinned(struct xfs_buf *bp) { |