On 06/24/2014 05:39 PM, Naoya Horiguchi wrote:
On Fri, Jun 20, 2014 at 05:49:36PM +0200, Vlastimil Babka wrote:Compaction scanners regularly check for lock contention and need_resched() through the compact_checklock_irqsave() function. However, if there is no contention, the lock can be held and IRQ disabled for potentially long time. This has been addressed by commit b2eef8c0d0 ("mm: compaction: minimise the time IRQs are disabled while isolating pages for migration") for the migration scanner. However, the refactoring done by commit 748446bb6b ("mm: compaction: acquire the zone->lru_lock as late as possible") has changed the conditions soYou seem to refer to the incorrect commit, maybe you meant commit 2a1402aa044b?
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