From: Randy Dunlap <randy.dunlap@oracle.com>
To: linux-mm@kvack.org
Cc: Mel Gorman <mel@csn.ul.ie>, akpm <akpm@linux-foundation.org>
Subject: [PATCH] mm tracing: cleanup Documentation/trace/events-kmem.txt
Date: Thu, 17 Dec 2009 12:06:44 -0800 [thread overview]
Message-ID: <20091217120644.b32a3e5c.randy.dunlap@oracle.com> (raw)
From: Randy Dunlap <randy.dunlap@oracle.com>
Clean up typos/grammos/spellos in events-kmem.txt.
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Mel Gorman <mel@csn.ul.ie>
---
Documentation/trace/events-kmem.txt | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
--- linux-2.6.32-git14.orig/Documentation/trace/events-kmem.txt
+++ linux-2.6.32-git14/Documentation/trace/events-kmem.txt
@@ -1,7 +1,7 @@
Subsystem Trace Points: kmem
-The tracing system kmem captures events related to object and page allocation
-within the kernel. Broadly speaking there are four major subheadings.
+The kmem tracing system captures events related to object and page allocation
+within the kernel. Broadly speaking there are five major subheadings.
o Slab allocation of small objects of unknown type (kmalloc)
o Slab allocation of small objects of known type
@@ -9,7 +9,7 @@ within the kernel. Broadly speaking ther
o Per-CPU Allocator Activity
o External Fragmentation
-This document will describe what each of the tracepoints are and why they
+This document describes what each of the tracepoints is and why they
might be useful.
1. Slab allocation of small objects of unknown type
@@ -34,7 +34,7 @@ kmem_cache_free call_site=%lx ptr=%p
These events are similar in usage to the kmalloc-related events except that
it is likely easier to pin the event down to a specific cache. At the time
of writing, no information is available on what slab is being allocated from,
-but the call_site can usually be used to extrapolate that information
+but the call_site can usually be used to extrapolate that information.
3. Page allocation
==================
@@ -80,9 +80,9 @@ event indicating whether it is for a per
When the per-CPU list is too full, a number of pages are freed, each one
which triggers a mm_page_pcpu_drain event.
-The individual nature of the events are so that pages can be tracked
+The individual nature of the events is so that pages can be tracked
between allocation and freeing. A number of drain or refill pages that occur
-consecutively imply the zone->lock being taken once. Large amounts of PCP
+consecutively imply the zone->lock being taken once. Large amounts of per-CPU
refills and drains could imply an imbalance between CPUs where too much work
is being concentrated in one place. It could also indicate that the per-CPU
lists should be a larger size. Finally, large amounts of refills on one CPU
@@ -102,6 +102,6 @@ is important.
Large numbers of this event implies that memory is fragmenting and
high-order allocations will start failing at some time in the future. One
-means of reducing the occurange of this event is to increase the size of
+means of reducing the occurrence of this event is to increase the size of
min_free_kbytes in increments of 3*pageblock_size*nr_online_nodes where
pageblock_size is usually the size of the default hugepage size.
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next reply other threads:[~2009-12-17 20:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-17 20:06 Randy Dunlap [this message]
2009-12-18 11:39 ` Mel Gorman
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