[8/8] xfs: __percpu_counter_compare() inode count debug too expensive

Commit Message

Dave Chinner March 17, 2021, 4:57 a.m. UTC

From: Dave Chinner <[e-mail]>

 - 21.92% __xfs_trans_commit
     - 21.62% xfs_log_commit_cil
	- 11.69% xfs_trans_unreserve_and_mod_sb
	   - 11.58% __percpu_counter_compare
	      - 11.45% __percpu_counter_sum
		 - 10.29% _raw_spin_lock_irqsave
		    - 10.28% do_raw_spin_lock
			 __pv_queued_spin_lock_slowpath

We debated just getting rid of it last time this came up and
there was no real objection to removing it. Now it's the biggest
scalability limitation for debug kernels even on smallish machines,
so let's just get rid of it.

Signed-off-by: Dave Chinner <[e-mail]>
Reviewed-by: Darrick J. Wong <[e-mail]>
---
 fs/xfs/xfs_trans.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

Patch

diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index b22a09e9daee..631cca73198f 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -618,19 +618,12 @@  xfs_trans_unreserve_and_mod_sb(
 		ASSERT(!error);
 	}
 
-	if (idelta) {
+	if (idelta)
 		percpu_counter_add_batch(&mp->m_icount, idelta,
 					 XFS_ICOUNT_BATCH);
-		if (idelta < 0)
-			ASSERT(__percpu_counter_compare(&mp->m_icount, 0,
-							XFS_ICOUNT_BATCH) >= 0);
-	}
 
-	if (ifreedelta) {
+	if (ifreedelta)
 		percpu_counter_add(&mp->m_ifree, ifreedelta);
-		if (ifreedelta < 0)
-			ASSERT(percpu_counter_compare(&mp->m_ifree, 0) >= 0);
-	}
 
 	if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
 		return;