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ANDROID: vendor_hooks: Add hooks for __alloc_pages_direct_reclaim

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Provide a vendor hook to allow drain_all_pages to be skipped
during direct reclaim in some cases to avoid delays caused by
it in cases when the benefits of draining pcp lists are known
to be small.

Bug: 220811627
Bug: 234405962
Signed-off-by: Liujie Xie <xieliujie@oppo.com>
Change-Id: I0805241f81e0a94afcf62c98e97cff125d4061e2
This commit is contained in:
Liujie Xie
2022-02-22 19:29:53 +08:00
committed by Carlos Llamas
parent 6f98ceb358
commit d1ba6f2de7
3 changed files with 12 additions and 1 deletions
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1
drivers/android/vendor_hooks.c
View File

@@ -210,6 +210,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_cpufreq_transition);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_set_balance_anon_file_reclaim);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_show_max_freq);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_page_referenced_check_bypass);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_drain_all_pages_bypass);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_free_task);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_after_enqueue_task);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_after_dequeue_task);

5
include/trace/hooks/mm.h
View File

@@ -25,6 +25,11 @@ DECLARE_RESTRICTED_HOOK(android_rvh_set_readahead_gfp_mask,
DECLARE_HOOK(android_vh_oom_check_panic,
TP_PROTO(struct oom_control *oc, int *ret),
TP_ARGS(oc, ret));
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));
#endif /* _TRACE_HOOK_MM_H */

7
mm/page_alloc.c
View File

@@ -72,6 +72,7 @@
#include <linux/padata.h>
#include <linux/khugepaged.h>
#include <linux/buffer_head.h>
#include <trace/hooks/mm.h>
#include <asm/sections.h>
#include <asm/tlbflush.h>
#include <asm/div64.h>
@@ -4725,6 +4726,7 @@ __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;
psi_memstall_enter(&pflags);
*did_some_progress = __perform_reclaim(gfp_mask, order, ac);
@@ -4741,7 +4743,10 @@ 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;
goto retry;
}