The patch titled
Subject: mm, pcp: share common code between memory hotplug and percpu sysctl handler
has been added to the -mm tree. Its filename is
mm-pcp-share-common-code-between-memory-hotplug-and-percpu-sysctl-handler.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-pcp-share-common-code-between-memory-hotplug-and-percpu-sysctl-handler.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-pcp-share-common-code-between-memory-hotplug-and-percpu-sysctl-handler.patch
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------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Subject: mm, pcp: share common code between memory hotplug and percpu sysctl handler
Both the percpu_pagelist_fraction sysctl handler and memory hotplug have a
common requirement of updating the pcpu page allocation batch and high
values. Split the relevant helper to share common code.
No functional change.
Link: http://lkml.kernel.org/r/20191018105606.3249-2-mgorman@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Tested-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [4.1+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 23 ++++++++++++-----------
1 file changed, 12 insertions(+), 11 deletions(-)
--- a/mm/page_alloc.c~mm-pcp-share-common-code-between-memory-hotplug-and-percpu-sysctl-handler
+++ a/mm/page_alloc.c
@@ -7985,6 +7985,15 @@ int lowmem_reserve_ratio_sysctl_handler(
return 0;
}
+static void __zone_pcp_update(struct zone *zone)
+{
+ unsigned int cpu;
+
+ for_each_possible_cpu(cpu)
+ pageset_set_high_and_batch(zone,
+ per_cpu_ptr(zone->pageset, cpu));
+}
+
/*
* percpu_pagelist_fraction - changes the pcp->high for each zone on each
* cpu. It is the fraction of total pages in each zone that a hot per cpu
@@ -8016,13 +8025,8 @@ int percpu_pagelist_fraction_sysctl_hand
if (percpu_pagelist_fraction == old_percpu_pagelist_fraction)
goto out;
- for_each_populated_zone(zone) {
- unsigned int cpu;
-
- for_each_possible_cpu(cpu)
- pageset_set_high_and_batch(zone,
- per_cpu_ptr(zone->pageset, cpu));
- }
+ for_each_populated_zone(zone)
+ __zone_pcp_update(zone);
out:
mutex_unlock(&pcp_batch_high_lock);
return ret;
@@ -8521,11 +8525,8 @@ void free_contig_range(unsigned long pfn
*/
void __meminit zone_pcp_update(struct zone *zone)
{
- unsigned cpu;
mutex_lock(&pcp_batch_high_lock);
- for_each_possible_cpu(cpu)
- pageset_set_high_and_batch(zone,
- per_cpu_ptr(zone->pageset, cpu));
+ __zone_pcp_update(zone);
mutex_unlock(&pcp_batch_high_lock);
}
#endif
_
Patches currently in -mm which might be from mgorman@xxxxxxxxxxxxxxxxxxx are
mm-pcp-share-common-code-between-memory-hotplug-and-percpu-sysctl-handler.patch
mm-meminit-recalculate-pcpu-batch-and-high-limits-after-init-completes.patch
mm-pcpu-make-zone-pcp-updates-and-reset-internal-to-the-mm.patch
