On Mon, 23 Apr 2007, Hisashi Hifumi wrote: > > PageLRU flag operation is protected by zone->lru_lock, so > SetPageLRU/ClearPageLRU > can be replaced to __SetPageLRU/__ClearPageLRU non-atomic bit operation.
No. The PG_lru flag bit is just one bit amongst many others: what of concurrent operations changing other bits in that same unsigned long e.g. trying to lock the page by setting PG_locked? There are some places where such micro-optimizations can be made (typically while first allocating the page); but in general, no. Hugh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
