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ANDROID: vendor_hooks: Add hooks for pcp related optimization.

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We want to make some optimizations to the pcp buffer. First, when directly recycling, we skip drain_all_pages when it is known that the pcp buffer is small to reduce zone->lock contention. In addition, the default pcp buffer size is still relatively small for mobile phones with large memory. We want to increase the pcp buffer area to reduce zone->lock contention.

Bug: 418695654

Change-Id: I38c7a3715500918d839e4363bbcc41cdbf4bd643
Signed-off-by: Marcus Ma <maminghui5@xiaomi.corp-partner.google.com>
This commit is contained in:
Marcus Ma
2025-05-19 21:04:39 +08:00
committed by Treehugger Robot
parent ad7902a401
commit 58b3f63bc6
3 changed files with 16 additions and 1 deletions
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2
drivers/android/vendor_hooks.c
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@@ -481,3 +481,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_filemap_map_pages_range);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_vprintk_store);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_folio_referenced_check_bypass);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_calculate_totalreserve_pages);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_drain_all_pages_bypass);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_pageset_update);

8
include/trace/hooks/mm.h
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@@ -315,6 +315,14 @@ DECLARE_HOOK(android_vh_filemap_map_pages_range,
DECLARE_HOOK(android_vh_calculate_totalreserve_pages,
TP_PROTO(bool *skip),
TP_ARGS(skip));
DECLARE_HOOK(android_vh_drain_all_pages_bypass,
TP_PROTO(gfp_t gfp_mask, unsigned int order, unsigned long alloc_flags,
int migratetype, unsigned long did_some_progress,
bool *bypass),
TP_ARGS(gfp_mask, order, alloc_flags, migratetype, did_some_progress, bypass));
DECLARE_HOOK(android_vh_pageset_update,
TP_PROTO(unsigned long *high, unsigned long *batch),
TP_ARGS(high, batch));
#endif /* _TRACE_HOOK_MM_H */
/* This part must be outside protection */

7
mm/page_alloc.c
View File

@@ -5026,6 +5026,7 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
struct page *page = NULL;
unsigned long pflags;
bool drained = false;
bool skip_pcp_drain = false;
trace_android_vh_mm_alloc_pages_direct_reclaim_enter(order);
psi_memstall_enter(&pflags);
@@ -5043,7 +5044,10 @@ retry:
*/
if (!page && !drained) {
unreserve_highatomic_pageblock(ac, false);
drain_all_pages(NULL);
trace_android_vh_drain_all_pages_bypass(gfp_mask, order,
alloc_flags, ac->migratetype, *did_some_progress, &skip_pcp_drain);
if (!skip_pcp_drain)
drain_all_pages(NULL);
drained = true;
++retry_times;
goto retry;
@@ -7475,6 +7479,7 @@ static int zone_highsize(struct zone *zone, int batch, int cpu_online)
static void pageset_update(struct per_cpu_pages *pcp, unsigned long high,
unsigned long batch)
{
trace_android_vh_pageset_update(&high, &batch);
WRITE_ONCE(pcp->batch, batch);
WRITE_ONCE(pcp->high, high);
}