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mm/damon/reclaim: add a parameter called skip_anon for avoiding anonymous pages reclamation

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In some cases, for example if users have confidence at anonymous pages
management or the swap device is too slow, users would want to avoid
DAMON_RECLAIM swapping the anonymous pages out.  For such case, add yet
another DAMON_RECLAIM parameter, namely 'skip_anon'.  When it is set as
'Y', DAMON_RECLAIM will avoid reclaiming anonymous pages using a DAMOS
filter.

Link: https://lkml.kernel.org/r/20221205230830.144349-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2022-12-05 23:08:22 +00:00 committed by Andrew Morton
parent 18250e78f9
commit 66d9faec07
1 changed files with 19 additions and 0 deletions
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19
mm/damon/reclaim.c
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@ -98,6 +98,15 @@ module_param(monitor_region_start, ulong, 0600);
static unsigned long monitor_region_end __read_mostly;
module_param(monitor_region_end, ulong, 0600);
/*
* Skip anonymous pages reclamation.
*
* If this parameter is set as ``Y``, DAMON_RECLAIM does not reclaim anonymous
* pages. By default, ``N``.
*/
static bool skip_anon __read_mostly;
module_param(skip_anon, bool, 0600);
/*
* PID of the DAMON thread
*
@ -142,6 +151,7 @@ static struct damos *damon_reclaim_new_scheme(void)
static int damon_reclaim_apply_parameters(void)
{
struct damos *scheme;
struct damos_filter *filter;
int err = 0;
err = damon_set_attrs(ctx, &damon_reclaim_mon_attrs);
@ -152,6 +162,15 @@ static int damon_reclaim_apply_parameters(void)
scheme = damon_reclaim_new_scheme();
if (!scheme)
return -ENOMEM;
if (skip_anon) {
filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true);
if (!filter) {
/* Will be freed by next 'damon_set_schemes()' below */
damon_destroy_scheme(scheme);
return -ENOMEM;
}
damos_add_filter(scheme, filter);
}
damon_set_schemes(ctx, &scheme, 1);
return damon_set_region_biggest_system_ram_default(target,