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authorBob Peterson <rpeterso@redhat.com>2015-06-12 20:15:54 +0200
committerBob Peterson <rpeterso@redhat.com>2015-06-18 19:17:59 +0200
commite7ccaf5fe1590667b3fa2f8df5c5ec9ba0dc5b85 (patch)
tree168c1f810fac94f8696fa491bee923e42d1677b7
parentgfs2: Don't support fallocate on jdata files (diff)
downloadlinux-e7ccaf5fe1590667b3fa2f8df5c5ec9ba0dc5b85.tar.xz
linux-e7ccaf5fe1590667b3fa2f8df5c5ec9ba0dc5b85.zip
GFS2: Don't add all glocks to the lru
The glocks used for resource groups often come and go hundreds of thousands of times per second. Adding them to the lru list just adds unnecessary contention for the lru_lock spin_lock, especially considering we're almost certainly going to re-use the glock and take it back off the lru microseconds later. We never want the glock shrinker to cull them anyway. This patch adds a new bit in the glops that determines which glock types get put onto the lru list and which ones don't. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Acked-by: Steven Whitehouse <swhiteho@redhat.com>
-rw-r--r--fs/gfs2/glock.c3
-rw-r--r--fs/gfs2/glops.c6
-rw-r--r--fs/gfs2/incore.h1
3 files changed, 7 insertions, 3 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 0fa8062f85a7..a38e38f7b6fc 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1076,7 +1076,8 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
!test_bit(GLF_DEMOTE, &gl->gl_flags))
fast_path = 1;
}
- if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl))
+ if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl) &&
+ (glops->go_flags & GLOF_LRU))
gfs2_glock_add_to_lru(gl);
trace_gfs2_glock_queue(gh, 0);
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index fe91951c3361..1249b2bb2830 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -561,7 +561,7 @@ const struct gfs2_glock_operations gfs2_inode_glops = {
.go_lock = inode_go_lock,
.go_dump = inode_go_dump,
.go_type = LM_TYPE_INODE,
- .go_flags = GLOF_ASPACE,
+ .go_flags = GLOF_ASPACE | GLOF_LRU,
};
const struct gfs2_glock_operations gfs2_rgrp_glops = {
@@ -584,10 +584,12 @@ const struct gfs2_glock_operations gfs2_freeze_glops = {
const struct gfs2_glock_operations gfs2_iopen_glops = {
.go_type = LM_TYPE_IOPEN,
.go_callback = iopen_go_callback,
+ .go_flags = GLOF_LRU,
};
const struct gfs2_glock_operations gfs2_flock_glops = {
.go_type = LM_TYPE_FLOCK,
+ .go_flags = GLOF_LRU,
};
const struct gfs2_glock_operations gfs2_nondisk_glops = {
@@ -596,7 +598,7 @@ const struct gfs2_glock_operations gfs2_nondisk_glops = {
const struct gfs2_glock_operations gfs2_quota_glops = {
.go_type = LM_TYPE_QUOTA,
- .go_flags = GLOF_LVB,
+ .go_flags = GLOF_LVB | GLOF_LRU,
};
const struct gfs2_glock_operations gfs2_journal_glops = {
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 304a22315448..a1ec7c20e498 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -225,6 +225,7 @@ struct gfs2_glock_operations {
const unsigned long go_flags;
#define GLOF_ASPACE 1
#define GLOF_LVB 2
+#define GLOF_LRU 4
};
enum {