|author||Anton Arapov <email@example.com>||2012-10-29 11:15:37 +0100|
|committer||Anton Arapov <firstname.lastname@example.org>||2012-10-29 11:15:37 +0100|
Signed-off-by: Anton Arapov <email@example.com>
Diffstat (limited to 'Documentation/sysctl/vm.txt')
1 files changed, 21 insertions, 23 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 96f0ee825be..078701fdbd4 100644
@@ -42,7 +42,6 @@ Currently, these files are in /proc/sys/vm:
- nr_trim_pages (only if CONFIG_MMU=n)
@@ -77,8 +76,8 @@ huge pages although processes will also directly compact memory as required.
-Contains the amount of dirty memory at which the pdflush background writeback
-daemon will start writeback.
+Contains the amount of dirty memory at which the background kernel
+flusher threads will start writeback.
Note: dirty_background_bytes is the counterpart of dirty_background_ratio. Only
one of them may be specified at a time. When one sysctl is written it is
@@ -90,7 +89,7 @@ other appears as 0 when read.
Contains, as a percentage of total system memory, the number of pages at which
-the pdflush background writeback daemon will start writing out dirty data.
+the background kernel flusher threads will start writing out dirty data.
@@ -113,9 +112,9 @@ retained.
This tunable is used to define when dirty data is old enough to be eligible
-for writeout by the pdflush daemons. It is expressed in 100'ths of a second.
-Data which has been dirty in-memory for longer than this interval will be
-written out next time a pdflush daemon wakes up.
+for writeout by the kernel flusher threads. It is expressed in 100'ths
+of a second. Data which has been dirty in-memory for longer than this
+interval will be written out next time a flusher thread wakes up.
@@ -129,7 +128,7 @@ data.
-The pdflush writeback daemons will periodically wake up and write `old' data
+The kernel flusher threads will periodically wake up and write `old' data
out to disk. This tunable expresses the interval between those wakeups, in
100'ths of a second.
@@ -426,16 +425,6 @@ See Documentation/vm/hugetlbpage.txt
-The current number of pdflush threads. This value is read-only.
-The value changes according to the number of dirty pages in the system.
-When necessary, additional pdflush threads are created, one per second, up to
This is available only on NOMMU kernels.
@@ -502,9 +491,10 @@ oom_dump_tasks
Enables a system-wide task dump (excluding kernel threads) to be
produced when the kernel performs an OOM-killing and includes such
-information as pid, uid, tgid, vm size, rss, cpu, oom_adj score, and
-name. This is helpful to determine why the OOM killer was invoked
-and to identify the rogue task that caused it.
+information as pid, uid, tgid, vm size, rss, nr_ptes, swapents,
+oom_score_adj score, and name. This is helpful to determine why the
+OOM killer was invoked, to identify the rogue task that caused it,
+and to determine why the OOM killer chose the task it did to kill.
If this is set to zero, this information is suppressed. On very
large systems with thousands of tasks it may not be feasible to dump
@@ -574,16 +564,24 @@ of physical RAM. See above.
-page-cluster controls the number of pages which are written to swap in
-a single attempt. The swap I/O size.
+page-cluster controls the number of pages up to which consecutive pages
+are read in from swap in a single attempt. This is the swap counterpart
+to page cache readahead.
+The mentioned consecutivity is not in terms of virtual/physical addresses,
+but consecutive on swap space - that means they were swapped out together.
It is a logarithmic value - setting it to zero means "1 page", setting
it to 1 means "2 pages", setting it to 2 means "4 pages", etc.
+Zero disables swap readahead completely.
The default value is three (eight pages at a time). There may be some
small benefits in tuning this to a different value if your workload is
+Lower values mean lower latencies for initial faults, but at the same time
+extra faults and I/O delays for following faults if they would have been part of
+that consecutive pages readahead would have brought in.