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Date: Thu, 7 Oct 2010 00:33:08 +0200 From: Andrea Righi <arighi@...eler.com> To: Randy Dunlap <rdunlap@...otime.net> Cc: Andrew Morton <akpm@...ux-foundation.org>, Greg Thelen <gthelen@...gle.com>, David Rientjes <rientjes@...gle.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: [PATCH] doc: clarify the behaviour of dirty_ratio/dirty_bytes When dirty_ratio or dirty_bytes is written the other parameter is disabled and set to 0 (in dirty_bytes_handler() / dirty_ratio_handler()). We do the same for dirty_background_ratio and dirty_background_bytes. However, in the sysctl documentation, we say that the counterpart becomes a function of the old value, that is not correct. Clarify the documentation reporting the actual behaviour. Reviewed-by: Greg Thelen <gthelen@...gle.com> Acked-by: David Rientjes <rientjes@...gle.com> Signed-off-by: Andrea Righi <arighi@...eler.com> --- Documentation/sysctl/vm.txt | 12 ++++++++---- 1 files changed, 8 insertions(+), 4 deletions(-) diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index b606c2c..30289fa 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -80,8 +80,10 @@ dirty_background_bytes Contains the amount of dirty memory at which the pdflush background writeback daemon will start writeback. -If dirty_background_bytes is written, dirty_background_ratio becomes a function -of its value (dirty_background_bytes / the amount of dirtyable system memory). +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 +immediately taken into account to evaluate the dirty memory limits and the +other appears as 0 when read. ============================================================== @@ -97,8 +99,10 @@ dirty_bytes Contains the amount of dirty memory at which a process generating disk writes will itself start writeback. -If dirty_bytes is written, dirty_ratio becomes a function of its value -(dirty_bytes / the amount of dirtyable system memory). +Note: dirty_bytes is the counterpart of dirty_ratio. Only one of them may be +specified at a time. When one sysctl is written it is immediately taken into +account to evaluate the dirty memory limits and the other appears as 0 when +read. Note: the minimum value allowed for dirty_bytes is two pages (in bytes); any value lower than this limit will be ignored and the old configuration will be -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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