Messages in this thread | | | Date | Mon, 26 Nov 2001 11:45:36 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] Scalable page cache |
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"David S. Miller" wrote: > > From: Ingo Molnar <mingo@elte.hu> > Date: Mon, 26 Nov 2001 22:09:02 +0100 (CET) > > something like this: > > - #define SetPageReferenced(page) set_bit(PG_referenced, &(page)->flags) > + #define SetPageReferenced(page) \ > + if (!test_bit(PG_referenced), &(page)->flags) \ > + set_bit(PG_referenced, &(page)->flags) > > On some platforms all the {test_,}{clear,change,set}_bit() ops give > you this cache behavior. How hard would it be to make ix86 act > similarly?
It would be nice to have a full complement of non-atomic bitops. At present we have __set_bit, but no __clear_bit, etc.
So we often do buslocked RMW's in places where it's not needed.
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