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    SubjectRe: [PATCH]vmscan: handle underflow for get_scan_ratio
    > On Fri, Apr 02, 2010 at 05:14:38PM +0800, KOSAKI Motohiro wrote:
    > > > > > This patch makes a lot of sense than previous. however I think <1% anon ratio
    > > > > > shouldn't happen anyway because file lru doesn't have reclaimable pages.
    > > > > > <1% seems no good reclaim rate.
    > > > >
    > > > > Oops, the above mention is wrong. sorry. only 1 page is still too big.
    > > > > because under streaming io workload, the number of scanning anon pages should
    > > > > be zero. this is very strong requirement. if not, backup operation will makes
    > > > > a lot of swapping out.
    > > > Sounds there is no big impact for the workload which you mentioned with the patch.
    > > > please see below descriptions.
    > > > I updated the description of the patch as fengguang suggested.
    > >
    > > Umm.. sorry, no.
    > >
    > > "one fix but introduce another one bug" is not good deal. instead,
    > > I'll revert the guilty commit at first as akpm mentioned.
    > Even we revert the commit, the patch still has its benefit, as it increases
    > calculation precision, right?

    no, you shouldn't ignore the regression case.

    If we can remove the streaming io corner case by another patch, this patch
    can be considered to merge.

    thanks.




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