The patch titled
Subject: mm/compaction: factor out code to test if we should run compaction for target order
has been added to the -mm mm-unstable branch. Its filename is
mm-compaction-factor-out-code-to-test-if-we-should-run-compaction-for-target-order.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-compaction-factor-out-code-to-test-if-we-should-run-compaction-for-target-order.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Subject: mm/compaction: factor out code to test if we should run compaction for target order
Date: Fri, 1 Sep 2023 23:51:41 +0800
We always do zone_watermark_ok check and compaction_suitable check
together to test if compaction for target order should be ran. Factor
these code out to remove repeat code.
Link: https://lkml.kernel.org/r/20230901155141.249860-7-shikemeng@xxxxxxxxxxxxxxx
Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 66 +++++++++++++++++++++++++++-------------------
1 file changed, 39 insertions(+), 27 deletions(-)
--- a/mm/compaction.c~mm-compaction-factor-out-code-to-test-if-we-should-run-compaction-for-target-order
+++ a/mm/compaction.c
@@ -2378,6 +2378,30 @@ bool compaction_zonelist_suitable(struct
return false;
}
+/*
+ * Should we do compaction for target allocation order.
+ * Return COMPACT_SUCCESS if allocation for target order can be already
+ * satisfied
+ * Return COMPACT_SKIPPED if compaction for target order is likely to fail
+ * Return COMPACT_CONTINUE if compaction for target order should be ran
+ */
+static enum compact_result
+compaction_suit_allocation_order(struct zone *zone, unsigned int order,
+ int highest_zoneidx, unsigned int alloc_flags)
+{
+ unsigned long watermark;
+
+ watermark = wmark_pages(zone, alloc_flags & ALLOC_WMARK_MASK);
+ if (zone_watermark_ok(zone, order, watermark, highest_zoneidx,
+ alloc_flags))
+ return COMPACT_SUCCESS;
+
+ if (!compaction_suitable(zone, order, highest_zoneidx))
+ return COMPACT_SKIPPED;
+
+ return COMPACT_CONTINUE;
+}
+
static enum compact_result
compact_zone(struct compact_control *cc, struct capture_control *capc)
{
@@ -2403,19 +2427,11 @@ compact_zone(struct compact_control *cc,
cc->migratetype = gfp_migratetype(cc->gfp_mask);
if (!is_via_compact_memory(cc->order)) {
- unsigned long watermark;
-
- /* Allocation can already succeed, nothing to do */
- watermark = wmark_pages(cc->zone,
- cc->alloc_flags & ALLOC_WMARK_MASK);
- if (zone_watermark_ok(cc->zone, cc->order, watermark,
- cc->highest_zoneidx, cc->alloc_flags))
- return COMPACT_SUCCESS;
-
- /* Compaction is likely to fail */
- if (!compaction_suitable(cc->zone, cc->order,
- cc->highest_zoneidx))
- return COMPACT_SKIPPED;
+ ret = compaction_suit_allocation_order(cc->zone, cc->order,
+ cc->highest_zoneidx,
+ cc->alloc_flags);
+ if (ret != COMPACT_CONTINUE)
+ return ret;
}
/*
@@ -2914,6 +2930,7 @@ static bool kcompactd_node_suitable(pg_d
int zoneid;
struct zone *zone;
enum zone_type highest_zoneidx = pgdat->kcompactd_highest_zoneidx;
+ enum compact_result ret;
for (zoneid = 0; zoneid <= highest_zoneidx; zoneid++) {
zone = &pgdat->node_zones[zoneid];
@@ -2921,14 +2938,10 @@ static bool kcompactd_node_suitable(pg_d
if (!populated_zone(zone))
continue;
- /* Allocation can already succeed, check other zones */
- if (zone_watermark_ok(zone, pgdat->kcompactd_max_order,
- min_wmark_pages(zone),
- highest_zoneidx, 0))
- continue;
-
- if (compaction_suitable(zone, pgdat->kcompactd_max_order,
- highest_zoneidx))
+ ret = compaction_suit_allocation_order(zone,
+ pgdat->kcompactd_max_order,
+ highest_zoneidx, ALLOC_WMARK_MIN);
+ if (ret == COMPACT_CONTINUE)
return true;
}
@@ -2951,6 +2964,8 @@ static void kcompactd_do_work(pg_data_t
.ignore_skip_hint = false,
.gfp_mask = GFP_KERNEL,
};
+ enum compact_result ret;
+
trace_mm_compaction_kcompactd_wake(pgdat->node_id, cc.order,
cc.highest_zoneidx);
count_compact_event(KCOMPACTD_WAKE);
@@ -2965,12 +2980,9 @@ static void kcompactd_do_work(pg_data_t
if (compaction_deferred(zone, cc.order))
continue;
- /* Allocation can already succeed, nothing to do */
- if (zone_watermark_ok(zone, cc.order,
- min_wmark_pages(zone), zoneid, 0))
- continue;
-
- if (!compaction_suitable(zone, cc.order, zoneid))
+ ret = compaction_suit_allocation_order(zone,
+ cc.order, zoneid, ALLOC_WMARK_MIN);
+ if (ret != COMPACT_CONTINUE)
continue;
if (kthread_should_stop())
_
Patches currently in -mm which might be from shikemeng@xxxxxxxxxxxxxxx are
mm-compaction-use-correct-list-in-move_freelist_head-tail.patch
mm-compaction-call-list_is_first-last-more-intuitively-in-move_freelist_head-tail.patch
mm-compaction-correctly-return-failure-with-bogus-compound_order-in-strict-mode.patch
mm-compaction-remove-repeat-compact_blockskip_flush-check-in-reset_isolation_suitable.patch
mm-compaction-improve-comment-of-is_via_compact_memory.patch
mm-compaction-factor-out-code-to-test-if-we-should-run-compaction-for-target-order.patch
