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SubjectRe: [PATCH] struct page shrinkage
Bulent Abali wrote:
> >Rik van Riel wrote:
> >>
> >> + clear_bit(PG_locked, &p->flags);
> >
> >Please don't do this. Please use the macros. If they're not
> >there, please create them.
> >
> >Bypassing the abstractions in this manner confounds people
> >who are implementing global locked-page accounting.
> >
> Andrew,
> I have an application which needs to know the total number of locked and
> dirtied pages at any given time. In which application locked-page
> accounting is done? I don't see it in base 2.5.5. Are there any patches
> or such that you can give pointers to?

This is in the ebulliently growing delayed-allocate and
buffer_head-bypass patches at

The implementation you're looking for is in dalloc-10-core.patch:
mm.h and mm/page_alloc.c

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