Messages in this thread |  | | | Date | Wed, 7 Jul 2010 07:28:14 +0900 | | Subject | Re: [PATCH 12/14] vmscan: Do not writeback pages in direct reclaim | | From | Minchan Kim <> |
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On Wed, Jul 7, 2010 at 5:27 AM, Johannes Weiner <hannes@cmpxchg.org> wrote: > On Tue, Jul 06, 2010 at 04:25:39PM +0100, Mel Gorman wrote: >> On Tue, Jul 06, 2010 at 08:24:57PM +0900, Minchan Kim wrote: >> > but it is still problem in case of swap file. >> > That's because swapout on swapfile cause file system writepage which >> > makes kernel stack overflow. >> >> I don't *think* this is a problem unless I missed where writing out to >> swap enters teh filesystem code. I'll double check. > > It bypasses the fs. On swapon, the blocks are resolved > (mm/swapfile.c::setup_swap_extents) and then the writeout path uses > bios directly (mm/page_io.c::swap_writepage). > > (GFP_NOFS still includes __GFP_IO, so allows swapping) > > Hannes
Thanks, Hannes. You're right. Extents would be resolved by setup_swap_extents. Sorry for confusing, Mel.
It was just my guessing about Kosaki's mention but he might say another story. Ignore me.
-- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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