The patch titled
Subject: mm: account for the number of times direct reclaimers get throttled
has been removed from the -mm tree. Its filename was
mm-account-for-the-number-of-times-direct-reclaimers-get-throttled.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxx>
Subject: mm: account for the number of times direct reclaimers get throttled
Under significant pressure when writing back to network-backed storage,
direct reclaimers may get throttled. This is expected to be a short-lived
event and the processes get woken up again but processes do get stalled.
This patch counts how many times such stalling occurs. It's up to the
administrator whether to reduce these stalls by increasing
min_free_kbytes.
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Mike Christie <michaelc@xxxxxxxxxxx>
Cc: Eric B Munson <emunson@xxxxxxxxx>
Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Cc: Sebastian Andrzej Siewior <sebastian@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/vm_event_item.h | 1 +
mm/vmscan.c | 3 +++
mm/vmstat.c | 1 +
3 files changed, 5 insertions(+)
diff -puN include/linux/vm_event_item.h~mm-account-for-the-number-of-times-direct-reclaimers-get-throttled include/linux/vm_event_item.h
--- a/include/linux/vm_event_item.h~mm-account-for-the-number-of-times-direct-reclaimers-get-throttled
+++ a/include/linux/vm_event_item.h
@@ -30,6 +30,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
FOR_ALL_ZONES(PGSTEAL_DIRECT),
FOR_ALL_ZONES(PGSCAN_KSWAPD),
FOR_ALL_ZONES(PGSCAN_DIRECT),
+ PGSCAN_DIRECT_THROTTLE,
#ifdef CONFIG_NUMA
PGSCAN_ZONE_RECLAIM_FAILED,
#endif
diff -puN mm/vmscan.c~mm-account-for-the-number-of-times-direct-reclaimers-get-throttled mm/vmscan.c
--- a/mm/vmscan.c~mm-account-for-the-number-of-times-direct-reclaimers-get-throttled
+++ a/mm/vmscan.c
@@ -2167,6 +2167,9 @@ static void throttle_direct_reclaim(gfp_
if (pfmemalloc_watermark_ok(pgdat))
return;
+ /* Account for the throttling */
+ count_vm_event(PGSCAN_DIRECT_THROTTLE);
+
/*
* If the caller cannot enter the filesystem, it's possible that it
* is due to the caller holding an FS lock or performing a journal
diff -puN mm/vmstat.c~mm-account-for-the-number-of-times-direct-reclaimers-get-throttled mm/vmstat.c
--- a/mm/vmstat.c~mm-account-for-the-number-of-times-direct-reclaimers-get-throttled
+++ a/mm/vmstat.c
@@ -745,6 +745,7 @@ const char * const vmstat_text[] = {
TEXTS_FOR_ZONES("pgsteal_direct")
TEXTS_FOR_ZONES("pgscan_kswapd")
TEXTS_FOR_ZONES("pgscan_direct")
+ "pgscan_direct_throttle",
#ifdef CONFIG_NUMA
"zone_reclaim_failed",
_
Patches currently in -mm which might be from mgorman@xxxxxxx are
origin.patch
linux-next.patch
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