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 <[email protected]> Acked-by: Steven Whitehouse <[email protected]> --- fs/gfs2/glock.c | 3 ++- fs/gfs2/glops.c | 6 ++++-- fs/gfs2/incore.h | 1 + 3 files changed, 7 insertions(+), 3 deletions(-) diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 0fa8062..a38e38f 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 fe91951..1249b2b 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 304a223..a1ec7c2 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 { -- 2.1.0
