* [PATCH] Documentation: incorrect formula to calculate CommitLimit value
@ 2014-05-22 12:04 Petr Oros
2014-05-22 20:20 ` Randy Dunlap
0 siblings, 1 reply; 2+ messages in thread
From: Petr Oros @ 2014-05-22 12:04 UTC (permalink / raw)
To: rdunlap; +Cc: linux-kernel, linux-doc, trivial
The formula to calculate "CommitLimit" value mentioned in kernel documentation is incorrect.
Right formula is: CommitLimit = ([total RAM pages] - [total huge TLB pages]) * overcommit_ratio / 100 + [total swap pages]
Signed-off-by: Petr Oros <poros@redhat.com>
---
Documentation/filesystems/proc.txt | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 8b9cd8e..b58d764 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -854,7 +854,8 @@ WritebackTmp: Memory used by FUSE for temporary writeback buffers
if strict overcommit accounting is enabled (mode 2 in
'vm.overcommit_memory').
The CommitLimit is calculated with the following formula:
- CommitLimit = ('vm.overcommit_ratio' * Physical RAM) + Swap
+ CommitLimit = ([total RAM pages] - [total huge TLB pages]) *
+ overcommit_ratio / 100 + [total swap pages]
For example, on a system with 1G of physical RAM and 7G
of swap with a `vm.overcommit_ratio` of 30 it would
yield a CommitLimit of 7.3G.
--
1.9.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] Documentation: incorrect formula to calculate CommitLimit value
2014-05-22 12:04 [PATCH] Documentation: incorrect formula to calculate CommitLimit value Petr Oros
@ 2014-05-22 20:20 ` Randy Dunlap
0 siblings, 0 replies; 2+ messages in thread
From: Randy Dunlap @ 2014-05-22 20:20 UTC (permalink / raw)
To: poros; +Cc: linux-kernel, linux-doc, trivial
On 05/22/2014 05:04 AM, Petr Oros wrote:
> The formula to calculate "CommitLimit" value mentioned in kernel documentation is incorrect.
> Right formula is: CommitLimit = ([total RAM pages] - [total huge TLB pages]) * overcommit_ratio / 100 + [total swap pages]
>
> Signed-off-by: Petr Oros <poros@redhat.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Jiri, please grab this patch.
Thanks.
> ---
> Documentation/filesystems/proc.txt | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
> index 8b9cd8e..b58d764 100644
> --- a/Documentation/filesystems/proc.txt
> +++ b/Documentation/filesystems/proc.txt
> @@ -854,7 +854,8 @@ WritebackTmp: Memory used by FUSE for temporary writeback buffers
> if strict overcommit accounting is enabled (mode 2 in
> 'vm.overcommit_memory').
> The CommitLimit is calculated with the following formula:
> - CommitLimit = ('vm.overcommit_ratio' * Physical RAM) + Swap
> + CommitLimit = ([total RAM pages] - [total huge TLB pages]) *
> + overcommit_ratio / 100 + [total swap pages]
> For example, on a system with 1G of physical RAM and 7G
> of swap with a `vm.overcommit_ratio` of 30 it would
> yield a CommitLimit of 7.3G.
>
--
~Randy
^ permalink raw reply [flat|nested] 2+ messages in thread
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2014-05-22 12:04 [PATCH] Documentation: incorrect formula to calculate CommitLimit value Petr Oros
2014-05-22 20:20 ` Randy Dunlap
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