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xfs: __percpu_counter_compare() inode count debug too expensive

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- 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 <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner 2021-03-22 09:52:06 -07:00 • committed by Darrick J. Wong
parent 1fea323ff0
commit 5825bea052
1 changed files with 2 additions and 9 deletions
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11
fs/xfs/xfs_trans.c
View file

@ -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;