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| 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_error.c | |
| parent | a53efbd5c6802e07b64aa767bb932da6913470c8 (diff) | |
| download | op-kernel-dev-7561d27e90fa0df0aac2a1d6b49c2a28eaae7026.zip op-kernel-dev-7561d27e90fa0df0aac2a1d6b49c2a28eaae7026.tar.gz | |
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_error.c')
| -rw-r--r-- | fs/xfs/xfs_error.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c index eaf86f5..6732b0a 100644 --- a/fs/xfs/xfs_error.c +++ b/fs/xfs/xfs_error.c @@ -58,6 +58,7 @@ static unsigned int xfs_errortag_random_default[] = { XFS_RANDOM_DROP_WRITES, XFS_RANDOM_LOG_BAD_CRC, XFS_RANDOM_LOG_ITEM_PIN, + XFS_RANDOM_BUF_LRU_REF, }; struct xfs_errortag_attr { @@ -163,6 +164,7 @@ XFS_ERRORTAG_ATTR_RW(ag_resv_critical, XFS_ERRTAG_AG_RESV_CRITICAL); XFS_ERRORTAG_ATTR_RW(drop_writes, XFS_ERRTAG_DROP_WRITES); XFS_ERRORTAG_ATTR_RW(log_bad_crc, XFS_ERRTAG_LOG_BAD_CRC); XFS_ERRORTAG_ATTR_RW(log_item_pin, XFS_ERRTAG_LOG_ITEM_PIN); +XFS_ERRORTAG_ATTR_RW(buf_lru_ref, XFS_ERRTAG_BUF_LRU_REF); static struct attribute *xfs_errortag_attrs[] = { XFS_ERRORTAG_ATTR_LIST(noerror), @@ -196,6 +198,7 @@ static struct attribute *xfs_errortag_attrs[] = { XFS_ERRORTAG_ATTR_LIST(drop_writes), XFS_ERRORTAG_ATTR_LIST(log_bad_crc), XFS_ERRORTAG_ATTR_LIST(log_item_pin), + XFS_ERRORTAG_ATTR_LIST(buf_lru_ref), NULL, }; |
