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xfs: avoid cil push lock if possible

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Because now it hurts when the CIL fills up.

  - 37.20% __xfs_trans_commit
      - 35.84% xfs_log_commit_cil
         - 19.34% _raw_spin_lock
            - do_raw_spin_lock
                 19.01% __pv_queued_spin_lock_slowpath
         - 4.20% xfs_log_ticket_ungrant
              0.90% xfs_log_space_wake


Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner
2022-07-07 18:56:08 +10:00
committed by Dave Chinner
parent 4eb56069cb
commit 1ccb0745a9
1 changed files with 11 additions and 3 deletions
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14
fs/xfs/xfs_log_cil.c
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@@ -1422,10 +1422,18 @@ xlog_cil_push_background(
ASSERT(!test_bit(XLOG_CIL_EMPTY, &cil->xc_flags)); ASSERT(!test_bit(XLOG_CIL_EMPTY, &cil->xc_flags));
/* /*
* Don't do a background push if we haven't used up all the * We are done if:
* space available yet. * - we haven't used up all the space available yet; or
* - we've already queued up a push; and
* - we're not over the hard limit; and
* - nothing has been over the hard limit.
*
* If so, we don't need to take the push lock as there's nothing to do.
*/ */
if (space_used < XLOG_CIL_SPACE_LIMIT(log)) { if (space_used < XLOG_CIL_SPACE_LIMIT(log) ||
(cil->xc_push_seq == cil->xc_current_sequence &&
space_used < XLOG_CIL_BLOCKING_SPACE_LIMIT(log) &&
!waitqueue_active(&cil->xc_push_wait))) {
up_read(&cil->xc_ctx_lock); up_read(&cil->xc_ctx_lock);
return; return;
} }