mm-tracepoint: rename page-free events
authorKonstantin Khlebnikov <khlebnikov@openvz.org>
Tue, 10 Jan 2012 23:07:09 +0000 (15:07 -0800)
committerGrazvydas Ignotas <notasas@gmail.com>
Mon, 25 Feb 2013 16:03:37 +0000 (18:03 +0200)
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>
Documentation/trace/events-kmem.txt
Documentation/trace/postprocess/trace-pagealloc-postprocess.pl
include/trace/events/kmem.h
mm/page_alloc.c

index aa82ee4..1948004 100644 (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.
 
index 7df50e8..0a120aa 100644 (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};
index a9536da..08fa272 100644 (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),
 
index 64653b2..a1a0dc5 100644 (file)
@@ -654,7 +654,7 @@ 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))
@@ -1218,7 +1218,7 @@ 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);
        }
 }