The patch titled
Subject: mm/page_alloc: drain the requested list first during bulk free
has been added to the -mm tree. Its filename is
mm-page_alloc-drain-the-requested-list-first-during-bulk-free.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-drain-the-requested-list-first-during-bulk-free.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-drain-the-requested-list-first-during-bulk-free.patch
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------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Subject: mm/page_alloc: drain the requested list first during bulk free
Prior to the series, pindex 0 (order-0 MIGRATE_UNMOVABLE) was always
skipped first and the precise reason is forgotten. A potential reason may
have been to artificially preserve MIGRATE_UNMOVABLE but there is no
reason why that would be optimal as it depends on the workload. The more
likely reason is that it was less complicated to do a pre-increment
instead of a post-increment in terms of overall code flow. As
free_pcppages_bulk() now typically receives the pindex of the PCP list
that exceeded high, always start draining that list.
Link: https://lkml.kernel.org/r/20220217002227.5739-5-mgorman@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Aaron Lu <aaron.lu@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/page_alloc.c~mm-page_alloc-drain-the-requested-list-first-during-bulk-free
+++ a/mm/page_alloc.c
@@ -1463,6 +1463,10 @@ static void free_pcppages_bulk(struct zo
* below while (list_empty(list)) loop.
*/
count = min(pcp->count, count);
+
+ /* Ensure requested pindex is drained first. */
+ pindex = pindex - 1;
+
while (count > 0) {
struct list_head *list;
int nr_pages;
_
Patches currently in -mm which might be from mgorman@xxxxxxxxxxxxxxxxxxx are
mm-page_alloc-fetch-the-correct-pcp-buddy-during-bulk-free.patch
mm-page_alloc-track-range-of-active-pcp-lists-during-bulk-free.patch
mm-page_alloc-simplify-how-many-pages-are-selected-per-pcp-list-during-bulk-free.patch
mm-page_alloc-drain-the-requested-list-first-during-bulk-free.patch
mm-page_alloc-free-pages-in-a-single-pass-during-bulk-free.patch
mm-page_alloc-limit-number-of-high-order-pages-on-pcp-during-bulk-free.patch
