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authorSteven Whitehouse <swhiteho@redhat.com>2007-01-17 10:09:20 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2007-02-05 13:37:04 -0500
commit3699e3a44bf56e0cd58c97e8655f375ad9b65d9d (patch)
tree9ac31dd5b99373614f0cd52cc5a41536aeea271e /fs/gfs2/glock.h
parenta8d638e30e768adc6956541f79f7bf05139ba475 (diff)
[GFS2] Clean up/speed up readdir
This removes the extra filldir callback which gfs2 was using to enclose an attempt at readahead for inodes during readdir. The code was too complicated and also hurts performance badly in the case that the getdents64/readdir call isn't being followed by stat() and it wasn't even getting it right all the time when it was. As a result, on my test box an "ls" of a directory containing 250000 files fell from about 7mins (freshly mounted, so nothing cached) to between about 15 to 25 seconds. When the directory content was cached, the time taken fell from about 3mins to about 4 or 5 seconds. Interestingly in the cached case, running "ls -l" once reduced the time taken for subsequent runs of "ls" to about 6 secs even without this patch. Now it turns out that there was a special case of glocks being used for prefetching the metadata, but because of the timeouts for these locks (set to 10 secs) the metadata was being timed out before it was being used and this the prefetch code was constantly trying to prefetch the same data over and over. Calling "ls -l" meant that the inodes were brought into memory and once the inodes are cached, the glocks are not disposed of until the inodes are pushed out of the cache, thus extending the lifetime of the glocks, and thus bringing down the time for subsequent runs of "ls" considerably. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/glock.h')
-rw-r--r--fs/gfs2/glock.h4
1 files changed, 0 insertions, 4 deletions
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index fb39108fc05c..bde02a7061ec 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -103,10 +103,6 @@ int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
103void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); 103void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
104void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); 104void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
105 105
106void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number,
107 const struct gfs2_glock_operations *glops,
108 unsigned int state, int flags);
109
110/** 106/**
111 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock 107 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
112 * @gl: the glock 108 * @gl: the glock