Messages in this thread Patch in this message | | | Date | Mon, 19 Feb 2001 20:05:56 -0200 (BRST) | From | Marcelo Tosatti <> | Subject | [PATCH] run_task_queue(&tq_disk) only if we written data to disk |
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Hi,
This patch makes page_launder() do actual disk IO (run_task_queue(&tq_disk)) only if IO was queued in the page freeing loop.
If we freed enough clean pages without needing do to any disk IO, there is no need to call run_task_queue(&tq_disk).
--- linux/mm/vmscan.c.orig Mon Feb 19 20:46:23 2001 +++ linux/mm/vmscan.c Mon Feb 19 20:47:21 2001 @@ -657,12 +657,13 @@ } /* - * We have to make sure the data is actually written to - * the disk now, otherwise we'll never get enough clean - * pages and the system will keep queueing dirty pages + * If we written something to disk, we have to make sure the data is + * actually written to the disk now, otherwise we'll never get enough + * clean pages and the system will keep queueing dirty pages * for flushing. */ - run_task_queue(&tq_disk); + if (launder_loop) + run_task_queue(&tq_disk); /* * Return the amount of pages we freed or made freeable.
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