linux-toradex.git/Documentation/sysctl, branch v2.6.25-rc2

Documentation: sysctl/kernel.txt: fix documentation reference

2008-02-14T00:21:20+00:00

This patch fixes a reference to Documentation/kmod.txt
which was apparently renamed to Documentation/debugging-modules.txt

Signed-off-by: Michael Opdenacker 
Cc: "Randy.Dunlap" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

brk: document randomize_va_space and CONFIG_COMPAT_BRK (was Re:

2008-02-09T22:24:08+00:00

Document randomize_va_space and CONFIG_COMPAT_BRK.

Signed-off-by: Jiri Kosina 
Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner

oom: add sysctl to enable task memory dump

2008-02-07T16:42:19+00:00

Adds a new sysctl, 'oom_dump_tasks', that enables the kernel to produce a
dump of all system tasks (excluding kernel threads) when performing an
OOM-killing.  Information includes pid, uid, tgid, vm size, rss, cpu,
oom_adj score, and name.

This is helpful for determining why there was an OOM condition and which
rogue task caused it.

It is configurable so that large systems, such as those with several
thousand tasks, do not incur a performance penalty associated with dumping
data they may not desire.

If an OOM was triggered as a result of a memory controller, the tasklist
shall be filtered to exclude tasks that are not a member of the same
cgroup.

Cc: Andrea Arcangeli 
Cc: Christoph Lameter 
Cc: Balbir Singh 
Signed-off-by: David Rientjes 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

get rid of NR_OPEN and introduce a sysctl_nr_open

2008-02-06T18:41:06+00:00

NR_OPEN (historically set to 1024*1024) actually forbids processes to open
more than 1024*1024 handles.

Unfortunatly some production servers hit the not so 'ridiculously high
value' of 1024*1024 file descriptors per process.

Changing NR_OPEN is not considered safe because of vmalloc space potential
exhaust.

This patch introduces a new sysctl (/proc/sys/fs/nr_open) wich defaults to
1024*1024, so that admins can decide to change this limit if their workload
needs it.

[akpm@linux-foundation.org: export it for sparc64]
Signed-off-by: Eric Dumazet 
Cc: Alan Cox 
Cc: Richard Henderson 
Cc: Ivan Kokshaysky 
Cc: "David S. Miller" 
Cc: Ralf Baechle 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/page-writeback: highmem_is_dirtyable option

2008-02-05T17:44:18+00:00

Add vm.highmem_is_dirtyable toggle

A 32 bit machine with HIGHMEM64 enabled running DCC has an MMAPed file of
approximately 2Gb size which contains a hash format that is written
randomly by the dbclean process.  On 2.6.16 this process took a few
minutes.  With lowmem only accounting of dirty ratios, this takes about 12
hours of 100% disk IO, all random writes.

Include a toggle in /proc/sys/vm/highmem_is_dirtyable which can be set to 1 to
add the highmem back to the total available memory count.

[akpm@linux-foundation.org: Fix the CONFIG_DETECT_SOFTLOCKUP=y build]
Signed-off-by: Bron Gondwana 
Cc: Ethan Solomita 
Cc: Peter Zijlstra 
Cc: WU Fengguang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Documentation: update hugetlb information

2007-12-18T03:28:17+00:00

The hugetlb documentation has gotten a bit out of sync with the current code.
Updated the sysctl file to refer to Documentation/vm/hugetlbpage.txt.  Update
that file to contain the current state of affairs (with the newer named sysctl
in place).

Signed-off-by: Nishanth Aravamudan 
Acked-by: Adam Litke 
Cc: William Lee Irwin III 
Cc: Dave Hansen 
Cc: David Gibson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

vm.txt: document min_free_pages as critical for correctness

2007-10-17T15:43:06+00:00

min_free_pages is critical for correctness, document it as such.

Signed-off-by: Pavel Machek 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Add a 00-INDEX file to Documentation/sysctl/

2007-10-17T15:43:05+00:00

Add a 00-INDEX file to Documentation/sysctl/

Signed-off-by: Jesper Juhl 
Cc: Rob Landley 
Cc: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

softlockup: add a /proc tuning parameter

2007-10-17T15:42:47+00:00

Control the trigger limit for softlockup warnings.  This is useful for
debugging softlockups, by lowering the softlockup_thresh to identify
possible softlockups earlier.

This patch:
1. Adds a sysctl softlockup_thresh with valid values of 1-60s
   (Higher value to disable false positives)
2. Changes the softlockup printk to print the cpu softlockup time

[akpm@linux-foundation.org: Fix various warnings and add definition of "two"]
Signed-off-by: Ravikiran Thirumalai 
Signed-off-by: Shai Fultheim 
Acked-by: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

oom: add oom_kill_allocating_task sysctl

2007-10-17T15:42:46+00:00

Adds a new sysctl, 'oom_kill_allocating_task', which will automatically kill
the OOM-triggering task instead of scanning through the tasklist to find a
memory-hogging target.  This is helpful for systems with an insanely large
number of tasks where scanning the tasklist significantly degrades
performance.

Cc: Andrea Arcangeli 
Acked-by: Christoph Lameter 
Signed-off-by: David Rientjes 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds