diff options
Diffstat (limited to 'Documentation/trace/events-kmem.txt')
-rw-r--r-- | Documentation/trace/events-kmem.txt | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/Documentation/trace/events-kmem.txt b/Documentation/trace/events-kmem.txt index aa82ee4a5a87..194800410061 100644 --- a/Documentation/trace/events-kmem.txt +++ b/Documentation/trace/events-kmem.txt | |||
@@ -40,8 +40,8 @@ but the call_site can usually be used to extrapolate that information. | |||
40 | ================== | 40 | ================== |
41 | mm_page_alloc page=%p pfn=%lu order=%d migratetype=%d gfp_flags=%s | 41 | mm_page_alloc page=%p pfn=%lu order=%d migratetype=%d gfp_flags=%s |
42 | mm_page_alloc_zone_locked page=%p pfn=%lu order=%u migratetype=%d cpu=%d percpu_refill=%d | 42 | mm_page_alloc_zone_locked page=%p pfn=%lu order=%u migratetype=%d cpu=%d percpu_refill=%d |
43 | mm_page_free_direct page=%p pfn=%lu order=%d | 43 | mm_page_free page=%p pfn=%lu order=%d |
44 | mm_pagevec_free page=%p pfn=%lu order=%d cold=%d | 44 | mm_page_free_batched page=%p pfn=%lu order=%d cold=%d |
45 | 45 | ||
46 | These four events deal with page allocation and freeing. mm_page_alloc is | 46 | These four events deal with page allocation and freeing. mm_page_alloc is |
47 | a simple indicator of page allocator activity. Pages may be allocated from | 47 | 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 | |||
53 | impairs performance by disabling interrupts, dirtying cache lines between | 53 | impairs performance by disabling interrupts, dirtying cache lines between |
54 | CPUs and serialising many CPUs. | 54 | CPUs and serialising many CPUs. |
55 | 55 | ||
56 | When a page is freed directly by the caller, the mm_page_free_direct event | 56 | When a page is freed directly by the caller, the only mm_page_free event |
57 | is triggered. Significant amounts of activity here could indicate that the | 57 | is triggered. Significant amounts of activity here could indicate that the |
58 | callers should be batching their activities. | 58 | callers should be batching their activities. |
59 | 59 | ||
60 | When pages are freed using a pagevec, the mm_pagevec_free is | 60 | When pages are freed in batch, the also mm_page_free_batched is triggered. |
61 | triggered. Broadly speaking, pages are taken off the LRU lock in bulk and | 61 | Broadly speaking, pages are taken off the LRU lock in bulk and |
62 | freed in batch with a pagevec. Significant amounts of activity here could | 62 | freed in batch with a page list. Significant amounts of activity here could |
63 | indicate that the system is under memory pressure and can also indicate | 63 | indicate that the system is under memory pressure and can also indicate |
64 | contention on the zone->lru_lock. | 64 | contention on the zone->lru_lock. |
65 | 65 | ||