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FROMGIT: fs: drop_caches: draining pages before dropping caches

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We expect a file page access after dropping caches should be a major
fault, but sometimes it's still a minor fault.  That's because a file page
can't be dropped if it's in a per-cpu pagevec.  Draining all pages from
per-cpu pagevec to lru list before trying to drop caches.

Link: https://lkml.kernel.org/r/20230630092203.16080-1-andrew.yang@mediatek.com
Change-Id: I9b03c53e39b87134d5ddd0c40ac9b36cf4d190cd
Signed-off-by: Andrew Yang <andrew.yang@mediatek.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Bug: 285794522
(cherry picked from commit a481c6fdf3e4fdf31bda91098dfbf46098037e76
 https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable)
This commit is contained in:
Andrew Yang 2023-06-30 17:22:02 +08:00 committed by Treehugger Robot
parent 2f76bb83b1
commit b0c06048a8
1 changed files with 2 additions and 0 deletions
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2
fs/drop_caches.c
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@ -10,6 +10,7 @@
#include <linux/writeback.h>
#include <linux/sysctl.h>
#include <linux/gfp.h>
#include <linux/swap.h>
#include "internal.h"
/* A global variable is a bit ugly, but it keeps the code simple */
@ -59,6 +60,7 @@ int drop_caches_sysctl_handler(struct ctl_table *table, int write,
static int stfu;
if (sysctl_drop_caches & 1) {
lru_add_drain_all();
iterate_supers(drop_pagecache_sb, NULL);
count_vm_event(DROP_PAGECACHE);
}