Re: [PATCH] vmscan: Do reclaim stall in case of mlocked page.

On Tue, Nov 15, 2011 at 12:37:23AM +0900, Minchan Kim wrote:

[1] made avoid unnecessary reclaim stall when second shrink_page_list(ie, synchronous
shrink_page_list) try to reclaim page_list which has not-dirty pages.
But it seems rather awkawrd on unevictable page.
The unevictable page in shrink_page_list would be moved into unevictable lru from page_list.
So it would be not on page_list when shrink_page_list returns.
Nevertheless it skips reclaim stall.

This patch fixes it so that it can do reclaim stall in case of mixing mlocked pages
and writeback pages on page_list.

[1] 7d3579e,vmscan: narrow the scenarios in whcih lumpy reclaim uses synchrounous reclaim

Lumpy isolates physically contiguous in the hope to free a bunch of
pages that can be merged to a bigger page.  If an unevictable page is
encountered, the chance of that is gone.  Why invest the allocation
latency when we know it won't pay off anymore?

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>