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    SubjectRe: [PATCH] documentation: clarify dirty_ratio and dirty_background_ratio description
    Date
    > The current documentation of dirty_ratio and dirty_background_ratio is a
    > bit misleading.
    >
    > In the documentation we say that they are "a percentage of total system
    > memory", but the current page writeback policy, intead, is to apply the
    > percentages to the dirtyable memory, that means free pages + reclaimable
    > pages.
    >
    > Better to be more explicit to clarify this concept.
    >
    > Signed-off-by: Andrea Righi <righi.andrea@gmail.com>

    looks good to me.



    > ---
    > Documentation/filesystems/proc.txt | 11 ++++++-----
    > 1 files changed, 6 insertions(+), 5 deletions(-)
    >
    > diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
    > index f566ad9..be69c8b 100644
    > --- a/Documentation/filesystems/proc.txt
    > +++ b/Documentation/filesystems/proc.txt
    > @@ -1380,15 +1380,16 @@ causes the kernel to prefer to reclaim dentries and inodes.
    > dirty_background_ratio
    > ----------------------
    >
    > -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.
    > +Contains, as a percentage of the dirtyable system memory (free pages +
    > +reclaimable pages), the number of pages at which the pdflush background
    > +writeback daemon will start writing out dirty data.
    >
    > dirty_ratio
    > -----------------
    >
    > -Contains, as a percentage of total system memory, the number of pages at which
    > -a process which is generating disk writes will itself start writing out dirty
    > -data.
    > +Contains, as a percentage of the dirtyable system memory (free pages +
    > +reclaimable pages), the number of pages at which a process which is generating
    > +disk writes will itself start writing out dirty data.
    >
    > dirty_writeback_centisecs
    > -------------------------







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