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authorJohannes Weiner <hannes@cmpxchg.org>2020-06-04 02:02:37 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 06:09:48 +0300
commitc843966c556d7370bb32e7319a6d164cb8c70ae2 (patch)
tree060e5e8cb49d2ee8bdde87836390b115ee87692d /kernel/sysctl.c
parent497a6c1b09902b22ceccc0f25ba4dd623e1ddb7d (diff)
downloadlinux-c843966c556d7370bb32e7319a6d164cb8c70ae2.tar.xz
mm: allow swappiness that prefers reclaiming anon over the file workingset
With the advent of fast random IO devices (SSDs, PMEM) and in-memory swap devices such as zswap, it's possible for swap to be much faster than filesystems, and for swapping to be preferable over thrashing filesystem caches. Allow setting swappiness - which defines the rough relative IO cost of cache misses between page cache and swap-backed pages - to reflect such situations by making the swap-preferred range configurable. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Rik van Riel <riel@surriel.com> Link: http://lkml.kernel.org/r/20200520232525.798933-4-hannes@cmpxchg.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sysctl.c')
-rw-r--r--kernel/sysctl.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 8a176d8727a3..7f15d292e44c 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -131,6 +131,7 @@ static unsigned long zero_ul;
static unsigned long one_ul = 1;
static unsigned long long_max = LONG_MAX;
static int one_hundred = 100;
+static int two_hundred = 200;
static int one_thousand = 1000;
#ifdef CONFIG_PRINTK
static int ten_thousand = 10000;
@@ -1391,7 +1392,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = &one_hundred,
+ .extra2 = &two_hundred,
},
#ifdef CONFIG_HUGETLB_PAGE
{