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authorBob Peterson <rpeterso@redhat.com>2015-06-05 08:38:57 -0500
committerBob Peterson <rpeterso@redhat.com>2015-06-19 07:40:22 -0500
commit39b0f1e9290880a6c905f639e7db6b646e302a4f (patch)
tree6076698c4f876af5e3228690f53346a57accd801 /fs/gfs2/glops.c
parente7ccaf5fe1590667b3fa2f8df5c5ec9ba0dc5b85 (diff)
downloadop-kernel-dev-39b0f1e9290880a6c905f639e7db6b646e302a4f.zip
op-kernel-dev-39b0f1e9290880a6c905f639e7db6b646e302a4f.tar.gz
GFS2: Don't brelse rgrp buffer_heads every allocation
This patch allows the block allocation code to retain the buffers for the resource groups so they don't need to be re-read from buffer cache with every request. This is a performance improvement that's especially noticeable when resource groups are very large. For example, with 2GB resource groups and 4K blocks, there can be 33 blocks for every resource group. This patch allows those 33 buffers to be kept around and not read in and thrown away with every operation. The buffers are released when the resource group is either synced or invalidated. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Reviewed-by: Steven Whitehouse <swhiteho@redhat.com> Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
Diffstat (limited to 'fs/gfs2/glops.c')
-rw-r--r--fs/gfs2/glops.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 1249b2b..fa3fa5e 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -144,6 +144,12 @@ static void rgrp_go_sync(struct gfs2_glock *gl)
struct gfs2_rgrpd *rgd;
int error;
+ spin_lock(&gl->gl_spin);
+ rgd = gl->gl_object;
+ if (rgd)
+ gfs2_rgrp_brelse(rgd);
+ spin_unlock(&gl->gl_spin);
+
if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
return;
GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
@@ -175,15 +181,17 @@ static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
{
struct gfs2_sbd *sdp = gl->gl_sbd;
struct address_space *mapping = &sdp->sd_aspace;
+ struct gfs2_rgrpd *rgd = gl->gl_object;
+
+ if (rgd)
+ gfs2_rgrp_brelse(rgd);
WARN_ON_ONCE(!(flags & DIO_METADATA));
gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
truncate_inode_pages_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
- if (gl->gl_object) {
- struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
+ if (rgd)
rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
- }
}
/**
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