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Message-ID: <20250124182140.2243862-3-mclapinski@google.com>
Date: Fri, 24 Jan 2025 19:21:40 +0100
From: Michal Clapinski <mclapinski@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>, Nitin Gupta <nigupta@...dia.com>,
Pasha Tatashin <tatashin@...gle.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Michal Clapinski <mclapinski@...gle.com>
Subject: [PATCH 2/2] mm/compaction: expose a new param for proactive compaction
Expose the diff between low and high watermark as a sysctl var.
Signed-off-by: Michal Clapinski <mclapinski@...gle.com>
---
mm/compaction.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index 29524242a16ef..fd546b797e544 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1921,6 +1921,7 @@ static int sysctl_compact_unevictable_allowed __read_mostly = CONFIG_COMPACT_UNE
* background. It takes values in the range [0, 100].
*/
static unsigned int __read_mostly sysctl_compaction_proactiveness = 20;
+static unsigned int __read_mostly sysctl_compaction_proactiveness_leeway = 10;
static int sysctl_extfrag_threshold = 500;
static int __read_mostly sysctl_compact_memory;
@@ -2254,7 +2255,7 @@ static unsigned int fragmentation_score_wmark(bool low)
* close to 100 (maximum).
*/
wmark_low = 100U - sysctl_compaction_proactiveness;
- return low ? wmark_low : min(wmark_low + 10, 100U);
+ return low ? wmark_low : min(wmark_low + sysctl_compaction_proactiveness_leeway, 100U);
}
static bool should_proactive_compact_node(pg_data_t *pgdat)
@@ -3314,6 +3315,15 @@ static struct ctl_table vm_compaction[] = {
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE_HUNDRED,
},
+ {
+ .procname = "compaction_proactiveness_leeway",
+ .data = &sysctl_compaction_proactiveness_leeway,
+ .maxlen = sizeof(sysctl_compaction_proactiveness_leeway),
+ .mode = 0644,
+ .proc_handler = compaction_proactiveness_sysctl_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_HUNDRED,
+ },
{
.procname = "extfrag_threshold",
.data = &sysctl_extfrag_threshold,
--
2.48.1.262.g85cc9f2d1e-goog
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