This patch correct obsolete comment caused by [1] and [2]. [1] 7ac6218, kswapd lockup fix [2] 32a4330, mm: prevent kswapd from freeing excessive amounts of lowmem Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Nick Piggin <npiggin@xxxxxxxxx> Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx> --- mm/vmscan.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 8d01243..f015d92 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2472,16 +2472,17 @@ static bool prepare_kswapd_sleep(pg_data_t *pgdat, int order, long remaining, * This can happen if the pages are all mlocked, or if they are all used by * device drivers (say, ZONE_DMA). Or if they are all in use by hugetlb. * What we do is to detect the case where all pages in the zone have been - * scanned twice and there has been zero successful reclaim. Mark the zone as - * dead and from now on, only perform a short scan. Basically we're polling - * the zone for when the problem goes away. + * scanned above 6 times of the number of reclaimable pages and there has + * been zero successful reclaim. Mark the zone as dead and from now on, + * only perform a short scan. Basically we're polling the zone for when + * the problem goes away. * * kswapd scans the zones in the highmem->normal->dma direction. It skips * zones which have free_pages > high_wmark_pages(zone), but once a zone is - * found to have free_pages <= high_wmark_pages(zone), we scan that zone and the - * lower zones regardless of the number of free pages in the lower zones. This - * interoperates with the page allocator fallback scheme to ensure that aging - * of pages is balanced across the zones. + * found to have free_pages <= high_wmark_pages(zone), we scan that zone and + * lower zones which don't have too many pages free. This interoperates with + * the page allocator fallback scheme to ensure that aging of pages is balanced + * across the zones. */ static unsigned long balance_pgdat(pg_data_t *pgdat, int order, int *classzone_idx) -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>