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Remove "arc_meta_used" from arc_adjust calculation 

Using "arc_meta_used" to determine if the arc's mru list is over it's
target value of "arc_p" doesn't seem correct. The size of the mru list
and the value of "arc_meta_used", although related, are completely
independent. Buffers contained in "arc_meta_used" may not even be
contained in the arc's mru list. As such, this patch removes
"arc_meta_used" from the calculation in arc_adjust.

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #2110
This commit is contained in:
Prakash Surya 2014-01-03 10:11:14 -08:00 committed by Brian Behlendorf
parent 94520ca462
commit 77765b540b
1 changed files with 1 additions and 2 deletions
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3
module/zfs/arc.c
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@ -2144,8 +2144,7 @@ arc_adjust(void)
*/ */
adjustment = MIN((int64_t)(arc_size - arc_c), adjustment = MIN((int64_t)(arc_size - arc_c),
(int64_t)(arc_anon->arcs_size + arc_mru->arcs_size + arc_meta_used - (int64_t)(arc_anon->arcs_size + arc_mru->arcs_size - arc_p));
arc_p));
if (adjustment > 0 && arc_mru->arcs_lsize[ARC_BUFC_DATA] > 0) { if (adjustment > 0 && arc_mru->arcs_lsize[ARC_BUFC_DATA] > 0) {
delta = MIN(arc_mru->arcs_lsize[ARC_BUFC_DATA], adjustment); delta = MIN(arc_mru->arcs_lsize[ARC_BUFC_DATA], adjustment);