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GFS2: aggressively issue revokes in gfs2_log_flush

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This patch looks at all the outstanding blocks in all the transactions
on the log, and moves the completed ones to the ail2 list.  Then it
issues revokes for these blocks.  This will hopefully speed things up
in situations where there is a lot of contention for glocks, especially
if they are acquired serially.

revoke_lo_before_commit will issue at most one log block's full of these
preemptive revokes. The amount of reserved log space that
gfs2_log_reserve() ignores has been incremented to allow for this extra
block.

This patch also consolidates the common revoke instructions into one
function, gfs2_add_revoke().

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Benjamin Marzinski
2013-06-14 11:38:29 -05:00
committed by Steven Whitehouse
parent 512cbf02fd
commit 5d054964f5
6 changed files with 78 additions and 23 deletions
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fs/gfs2/lops.c
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@@ -606,6 +606,7 @@ static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
struct page *page;
unsigned int length;
gfs2_write_revokes(sdp);
if (!sdp->sd_log_num_revoke)
return;