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mm-tracepoint: rename page-free events 

Rename mm_page_free_direct into mm_page_free and mm_pagevec_free into
mm_page_free_batched

Since v2.6.33-5426-gc475dab the kernel triggers mm_page_free_direct for
all freed pages, not only for directly freed.  So, let's name it properly.
 For pages freed via page-list we also trigger mm_page_free_batched event.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konstantin Khlebnikov 2012-01-10 15:07:09 -08:00 committed by Linus Torvalds
parent da066ad357
commit b413d48aa7
4 changed files with 20 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
Documentation/trace/events-kmem.txt
View File

@ -40,8 +40,8 @@ but the call_site can usually be used to extrapolate that information.
==================
mm_page_alloc page=%p pfn=%lu order=%d migratetype=%d gfp_flags=%s
mm_page_alloc_zone_locked page=%p pfn=%lu order=%u migratetype=%d cpu=%d percpu_refill=%d
mm_page_free_direct page=%p pfn=%lu order=%d
mm_pagevec_free page=%p pfn=%lu order=%d cold=%d
mm_page_free page=%p pfn=%lu order=%d
mm_page_free_batched page=%p pfn=%lu order=%d cold=%d
These four events deal with page allocation and freeing. mm_page_alloc is
a simple indicator of page allocator activity. Pages may be allocated from
@ -53,13 +53,13 @@ amounts of activity imply high activity on the zone->lock. Taking this lock
impairs performance by disabling interrupts, dirtying cache lines between
CPUs and serialising many CPUs.
When a page is freed directly by the caller, the mm_page_free_direct event
When a page is freed directly by the caller, the only mm_page_free event
is triggered. Significant amounts of activity here could indicate that the
callers should be batching their activities.
When pages are freed using a pagevec, the mm_pagevec_free is
triggered. Broadly speaking, pages are taken off the LRU lock in bulk and
freed in batch with a pagevec. Significant amounts of activity here could
When pages are freed in batch, the also mm_page_free_batched is triggered.
Broadly speaking, pages are taken off the LRU lock in bulk and
freed in batch with a page list. Significant amounts of activity here could
indicate that the system is under memory pressure and can also indicate
contention on the zone->lru_lock.

20
Documentation/trace/postprocess/trace-pagealloc-postprocess.pl
View File

@ -17,8 +17,8 @@ use Getopt::Long;
# Tracepoint events
use constant MM_PAGE_ALLOC => 1;
use constant MM_PAGE_FREE_DIRECT => 2;
use constant MM_PAGEVEC_FREE => 3;
use constant MM_PAGE_FREE => 2;
use constant MM_PAGE_FREE_BATCHED => 3;
use constant MM_PAGE_PCPU_DRAIN => 4;
use constant MM_PAGE_ALLOC_ZONE_LOCKED => 5;
use constant MM_PAGE_ALLOC_EXTFRAG => 6;
@ -223,10 +223,10 @@ EVENT_PROCESS:
# Perl Switch() sucks majorly
if ($tracepoint eq "mm_page_alloc") {
$perprocesspid{$process_pid}->{MM_PAGE_ALLOC}++;
} elsif ($tracepoint eq "mm_page_free_direct") {
$perprocesspid{$process_pid}->{MM_PAGE_FREE_DIRECT}++;
} elsif ($tracepoint eq "mm_pagevec_free") {
$perprocesspid{$process_pid}->{MM_PAGEVEC_FREE}++;
} elsif ($tracepoint eq "mm_page_free") {
$perprocesspid{$process_pid}->{MM_PAGE_FREE}++
} elsif ($tracepoint eq "mm_page_free_batched") {
$perprocesspid{$process_pid}->{MM_PAGE_FREE_BATCHED}++;
} elsif ($tracepoint eq "mm_page_pcpu_drain") {
$perprocesspid{$process_pid}->{MM_PAGE_PCPU_DRAIN}++;
$perprocesspid{$process_pid}->{STATE_PCPU_PAGES_DRAINED}++;
@ -336,8 +336,8 @@ sub dump_stats {
$process_pid,
$stats{$process_pid}->{MM_PAGE_ALLOC},
$stats{$process_pid}->{MM_PAGE_ALLOC_ZONE_LOCKED},
$stats{$process_pid}->{MM_PAGE_FREE_DIRECT},
$stats{$process_pid}->{MM_PAGEVEC_FREE},
$stats{$process_pid}->{MM_PAGE_FREE},
$stats{$process_pid}->{MM_PAGE_FREE_BATCHED},
$stats{$process_pid}->{MM_PAGE_PCPU_DRAIN},
$stats{$process_pid}->{HIGH_PCPU_DRAINS},
$stats{$process_pid}->{HIGH_PCPU_REFILLS},
@ -364,8 +364,8 @@ sub aggregate_perprocesspid() {
$perprocess{$process}->{MM_PAGE_ALLOC} += $perprocesspid{$process_pid}->{MM_PAGE_ALLOC};
$perprocess{$process}->{MM_PAGE_ALLOC_ZONE_LOCKED} += $perprocesspid{$process_pid}->{MM_PAGE_ALLOC_ZONE_LOCKED};
$perprocess{$process}->{MM_PAGE_FREE_DIRECT} += $perprocesspid{$process_pid}->{MM_PAGE_FREE_DIRECT};
$perprocess{$process}->{MM_PAGEVEC_FREE} += $perprocesspid{$process_pid}->{MM_PAGEVEC_FREE};
$perprocess{$process}->{MM_PAGE_FREE} += $perprocesspid{$process_pid}->{MM_PAGE_FREE};
$perprocess{$process}->{MM_PAGE_FREE_BATCHED} += $perprocesspid{$process_pid}->{MM_PAGE_FREE_BATCHED};
$perprocess{$process}->{MM_PAGE_PCPU_DRAIN} += $perprocesspid{$process_pid}->{MM_PAGE_PCPU_DRAIN};
$perprocess{$process}->{HIGH_PCPU_DRAINS} += $perprocesspid{$process_pid}->{HIGH_PCPU_DRAINS};
$perprocess{$process}->{HIGH_PCPU_REFILLS} += $perprocesspid{$process_pid}->{HIGH_PCPU_REFILLS};

4
include/trace/events/kmem.h
View File

@ -147,7 +147,7 @@ DEFINE_EVENT(kmem_free, kmem_cache_free,
TP_ARGS(call_site, ptr)
);
TRACE_EVENT(mm_page_free_direct,
TRACE_EVENT(mm_page_free,
TP_PROTO(struct page *page, unsigned int order),
@ -169,7 +169,7 @@ TRACE_EVENT(mm_page_free_direct,
__entry->order)
);
TRACE_EVENT(mm_pagevec_free,
TRACE_EVENT(mm_page_free_batched,
TP_PROTO(struct page *page, int cold),

4
mm/page_alloc.c
View File

@ -632,7 +632,7 @@ static bool free_pages_prepare(struct page *page, unsigned int order)
int i;
int bad = 0;
trace_mm_page_free_direct(page, order);
trace_mm_page_free(page, order);
kmemcheck_free_shadow(page, order);
if (PageAnon(page))
@ -1196,7 +1196,7 @@ void free_hot_cold_page_list(struct list_head *list, int cold)
struct page *page, *next;
list_for_each_entry_safe(page, next, list, lru) {
trace_mm_pagevec_free(page, cold);
trace_mm_page_free_batched(page, cold);
free_hot_cold_page(page, cold);
}
}