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Mel Gorman
dbbee9d5cd
There is a lack of clarity of what exactly local_irq_save/local_irq_restore protects in page_alloc.c . It conflates the protection of per-cpu page allocation structures with per-cpu vmstat deltas. This patch protects the PCP structure using local_lock which for most configurations is identical to IRQ enabling/disabling. The scope of the lock is still wider than it should be but this is decreased later. It is possible for the local_lock to be embedded safely within struct per_cpu_pages but it adds complexity to free_unref_page_list. [[email protected]: coding style fixes] [[email protected]: work around a pahole limitation with zero-sized struct pagesets] Link: https://lkml.kernel.org/r/[email protected] [[email protected]: Make pagesets static] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Mel Gorman <[email protected]> Acked-by: Vlastimil Babka <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Cc: Chuck Lever <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Jesper Dangaard Brouer <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Sebastian Andrzej Siewior <[email protected]> Cc: Thomas Gleixner <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>