[PATCH 2/5] mm: migrate: Add a tracepoint for migrate_pages
From: Mel Gorman
Date: Mon Oct 22 2012 - 04:09:05 EST
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: Mel Gorman <mgorman@xxxxxxx>
---
include/linux/migrate.h | 13 ++++++++-
include/trace/events/migrate.h | 51 ++++++++++++++++++++++++++++++++++++++++
mm/compaction.c | 3 +-
mm/memory-failure.c | 3 +-
mm/memory_hotplug.c | 3 +-
mm/mempolicy.c | 6 +++-
mm/migrate.c | 10 ++++++-
mm/page_alloc.c | 3 +-
8 files changed, 82 insertions(+), 10 deletions(-)
create mode 100644 include/trace/events/migrate.h
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index ce7e667..9d1c159 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -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; }
diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h
new file mode 100644
index 0000000..ec2a6cc
--- /dev/null
+++ b/include/trace/events/migrate.h
@@ -0,0 +1,51 @@
+#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>
diff --git a/mm/compaction.c b/mm/compaction.c
index 8c1a53a..11b455b 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -797,7 +797,8 @@ 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;
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index a6e2141..9d4489c 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1556,7 +1556,8 @@ 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",
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6a5b90d..b299e83 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -815,7 +815,8 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
}
/* this function returns # of failed pages */
ret = migrate_pages(&source, hotremove_migrate_alloc, 0,
- true, MIGRATE_SYNC);
+ true, MIGRATE_SYNC,
+ MR_MEMORY_HOTPLUG);
if (ret)
putback_lru_pages(&source);
}
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 5cffcb6..bd4fc4c 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -936,7 +936,8 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, new_node_page, dest,
- false, MIGRATE_SYNC);
+ false, MIGRATE_SYNC,
+ MR_SYSCALL);
if (err)
putback_lru_pages(&pagelist);
}
@@ -1177,7 +1178,8 @@ static long do_mbind(unsigned long start, unsigned long len,
if (!list_empty(&pagelist)) {
nr_failed = migrate_pages(&pagelist, new_vma_page,
(unsigned long)vma,
- false, MIGRATE_SYNC);
+ false, MIGRATE_SYNC,
+ MR_MEMPOLICY_MBIND);
if (nr_failed)
putback_lru_pages(&pagelist);
}
diff --git a/mm/migrate.c b/mm/migrate.c
index 04687f6..27be9c9 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -38,6 +38,9 @@
#include <asm/tlbflush.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/migrate.h>
+
#include "internal.h"
/*
@@ -958,7 +961,7 @@ out:
*/
int migrate_pages(struct list_head *from,
new_page_t get_new_page, unsigned long private, bool offlining,
- enum migrate_mode mode)
+ enum migrate_mode mode, int reason)
{
int retry = 1;
int nr_failed = 0;
@@ -1004,6 +1007,8 @@ out:
count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);
if (nr_failed)
count_vm_events(PGMIGRATE_FAIL, nr_failed);
+ trace_mm_migrate_pages(nr_succeeded, nr_failed, mode, reason);
+
if (!swapwrite)
current->flags &= ~PF_SWAPWRITE;
@@ -1145,7 +1150,8 @@ set_status:
err = 0;
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, new_page_node,
- (unsigned long)pm, 0, MIGRATE_SYNC);
+ (unsigned long)pm, 0, MIGRATE_SYNC,
+ MR_SYSCALL);
if (err)
putback_lru_pages(&pagelist);
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 55df691..3d361f6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5677,7 +5677,8 @@ static int __alloc_contig_migrate_range(unsigned long start, unsigned long end)
ret = migrate_pages(&cc.migratepages,
__alloc_contig_migrate_alloc,
- 0, false, MIGRATE_SYNC);
+ 0, false, MIGRATE_SYNC,
+ MR_CMA);
}
putback_lru_pages(&cc.migratepages);
--
1.7.7
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