Commit 7b2a2d4a authored by Mel Gorman's avatar Mel Gorman
Browse files

mm: migrate: Add a tracepoint for migrate_pages 



The pgmigrate_success and pgmigrate_fail vmstat counters tells the user
about migration activity but not the type or the reason. This patch adds
a tracepoint to identify the type of page migration and why the page is
being migrated.

Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
Reviewed-by: default avatarRik van Riel <riel@redhat.com>
parent 5647bc29

include/linux/migrate.h

+11 −2
Original line number Diff line number Diff line
@@ -7,6 +7,15 @@ 


typedef struct page *new_page_t(struct page *, unsigned long private, int **);



enum migrate_reason {

	MR_COMPACTION,

	MR_MEMORY_FAILURE,

	MR_MEMORY_HOTPLUG,

	MR_SYSCALL,		/* also applies to cpusets */

	MR_MEMPOLICY_MBIND,

	MR_CMA

};



#ifdef CONFIG_MIGRATION



extern void putback_lru_pages(struct list_head *l);
@@ -14,7 +23,7 @@ extern int migrate_page(struct address_space *, 
			struct page *, struct page *, enum migrate_mode);

extern int migrate_pages(struct list_head *l, new_page_t x,

			unsigned long private, bool offlining,

			enum migrate_mode mode);

			enum migrate_mode mode, int reason);

extern int migrate_huge_page(struct page *, new_page_t x,

			unsigned long private, bool offlining,

			enum migrate_mode mode);
@@ -35,7 +44,7 @@ extern int migrate_huge_page_move_mapping(struct address_space *mapping, 
static inline void putback_lru_pages(struct list_head *l) {}

static inline int migrate_pages(struct list_head *l, new_page_t x,

		unsigned long private, bool offlining,

		enum migrate_mode mode) { return -ENOSYS; }

		enum migrate_mode mode, int reason) { return -ENOSYS; }

static inline int migrate_huge_page(struct page *page, new_page_t x,

		unsigned long private, bool offlining,

		enum migrate_mode mode) { return -ENOSYS; }

include/trace/events/migrate.h

0 → 100644
+51 −0
Original line number Diff line number Diff line 
#undef TRACE_SYSTEM

#define TRACE_SYSTEM migrate



#if !defined(_TRACE_MIGRATE_H) || defined(TRACE_HEADER_MULTI_READ)

#define _TRACE_MIGRATE_H



#define MIGRATE_MODE						\

	{MIGRATE_ASYNC,		"MIGRATE_ASYNC"},		\

	{MIGRATE_SYNC_LIGHT,	"MIGRATE_SYNC_LIGHT"},		\

	{MIGRATE_SYNC,		"MIGRATE_SYNC"}		



#define MIGRATE_REASON						\

	{MR_COMPACTION,		"compaction"},			\

	{MR_MEMORY_FAILURE,	"memory_failure"},		\

	{MR_MEMORY_HOTPLUG,	"memory_hotplug"},		\

	{MR_SYSCALL,		"syscall_or_cpuset"},		\

	{MR_MEMPOLICY_MBIND,	"mempolicy_mbind"},		\

	{MR_CMA,		"cma"}



TRACE_EVENT(mm_migrate_pages,



	TP_PROTO(unsigned long succeeded, unsigned long failed,

		 enum migrate_mode mode, int reason),



	TP_ARGS(succeeded, failed, mode, reason),



	TP_STRUCT__entry(

		__field(	unsigned long,		succeeded)

		__field(	unsigned long,		failed)

		__field(	enum migrate_mode,	mode)

		__field(	int,			reason)

	),



	TP_fast_assign(

		__entry->succeeded	= succeeded;

		__entry->failed		= failed;

		__entry->mode		= mode;

		__entry->reason		= reason;

	),



	TP_printk("nr_succeeded=%lu nr_failed=%lu mode=%s reason=%s",

		__entry->succeeded,

		__entry->failed,

		__print_symbolic(__entry->mode, MIGRATE_MODE),

		__print_symbolic(__entry->reason, MIGRATE_REASON))

);



#endif /* _TRACE_MIGRATE_H */



/* This part must be outside protection */

#include <trace/define_trace.h>

mm/compaction.c

+2 −1
Original line number Diff line number Diff line
@@ -990,7 +990,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) 
		nr_migrate = cc->nr_migratepages;

		err = migrate_pages(&cc->migratepages, compaction_alloc,

				(unsigned long)cc, false,

				cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC);

				cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC,

				MR_COMPACTION);

		update_nr_listpages(cc);

		nr_remaining = cc->nr_migratepages;

mm/memory-failure.c

+2 −1
Original line number Diff line number Diff line
@@ -1558,7 +1558,8 @@ int soft_offline_page(struct page *page, int flags) 
					    page_is_file_cache(page));

		list_add(&page->lru, &pagelist);

		ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL,

							false, MIGRATE_SYNC);

							false, MIGRATE_SYNC,

							MR_MEMORY_FAILURE);

		if (ret) {

			putback_lru_pages(&pagelist);

			pr_info("soft offline: %#lx: migration failed %d, type %lx\n",

mm/memory_hotplug.c

+2 −1
Original line number Diff line number Diff line
@@ -812,7 +812,8 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) 
		 * migrate_pages returns # of failed pages.

		 */

		ret = migrate_pages(&source, alloc_migrate_target, 0,

							true, MIGRATE_SYNC);

							true, MIGRATE_SYNC,

							MR_MEMORY_HOTPLUG);

		if (ret)

			putback_lru_pages(&source);

	}

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