[PATCH 15/16] xfs: only run xfs_error_test if error injection is active

Dave Chinner
2010-11-08T08:55:13Z

From: Dave Chinner <dchinner@redhat.com>

Recent tests writing lots of small files showed the flusher thread
being CPU bound and taking a long time to do allocations on a debug
kernel. perf showed this as the prime reason:

samples pcnt function DSO
_______ _____ ___________________________ _________________

224648.00 36.8% xfs_error_test [kernel.kallsyms]
86045.00 14.1% xfs_btree_check_sblock [kernel.kallsyms]
39778.00 6.5% prandom32 [kernel.kallsyms]
37436.00 6.1% xfs_btree_increment [kernel.kallsyms]
29278.00 4.8% xfs_btree_get_rec [kernel.kallsyms]
27717.00 4.5% random32 [kernel.kallsyms]

Walking btree blocks during allocation checking them requires each
block (a cache hit, so no I/O) call xfs_error_test(), which then
does a random32() call as teh first operation. IOWs, ~50% of the
CPU is being consumed just testing whether we need to inject an
error, even though error injection is not active.

Kill this overhead when error injection is not active by adding a
global counter of active error traps and only calling into
xfs_error_test when fault injection is active.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
fs/xfs/xfs_error.c | 3 +++
fs/xfs/xfs_error.h | 5 +++--
2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index ed99902..c78cc6a 100644
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -58,6 +58,7 @@ xfs_error_trap(int e)
int xfs_etest[XFS_NUM_INJECT_ERROR];
int64_t xfs_etest_fsid[XFS_NUM_INJECT_ERROR];
char * xfs_etest_fsname[XFS_NUM_INJECT_ERROR];
+int xfs_error_test_active;

int
xfs_error_test(int error_tag, int *fsidp, char *expression,
@@ -108,6 +109,7 @@ xfs_errortag_add(int error_tag, xfs_mount_t *mp)
len = strlen(mp->m_fsname);
xfs_etest_fsname[i] = kmem_alloc(len + 1, KM_SLEEP);
strcpy(xfs_etest_fsname[i], mp->m_fsname);
+ xfs_error_test_active++;
return 0;
}
}
@@ -137,6 +139,7 @@ xfs_errortag_clearall(xfs_mount_t *mp, int loud)
xfs_etest_fsid[i] = 0LL;
kmem_free(xfs_etest_fsname[i]);
xfs_etest_fsname[i] = NULL;
+ xfs_error_test_active--;
}
}

diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h
index c2c1a07..f338847 100644
--- a/fs/xfs/xfs_error.h
+++ b/fs/xfs/xfs_error.h
@@ -127,13 +127,14 @@ extern void xfs_corruption_error(const char *tag, int level,
#define XFS_RANDOM_BMAPIFORMAT XFS_RANDOM_DEFAULT

#ifdef DEBUG
+extern int xfs_error_test_active;
extern int xfs_error_test(int, int *, char *, int, char *, unsigned long);

#define XFS_NUM_INJECT_ERROR 10
#define XFS_TEST_ERROR(expr, mp, tag, rf) \
- ((expr) || \
+ ((expr) || (xfs_error_test_active && \
xfs_error_test((tag), (mp)->m_fixedfsid, "expr", __LINE__, __FILE__, \
- (rf)))
+ (rf))))

extern int xfs_errortag_add(int error_tag, xfs_mount_t *mp);
extern int xfs_errortag_clearall(xfs_mount_t *mp, int loud);
--
1.7.2.3