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Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under zone pressure

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From: Andrew Morton
Subject: Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under zone pressure
Date: Thursday, March 11, 2010 - 4:41 pm

On Mon,  8 Mar 2010 11:48:20 +0000
Mel Gorman <mel@csn.ul.ie> wrote:


clear_bdi_congested() is called each time a write completes and the
queue is below the congestion threshold.

So if the page allocator or kswapd call congestion_wait() against a
non-congested queue, they'll wake up on the very next write completion.

Hence the above-quoted claim seems to me to be a significant mis-analysis and
perhaps explains why the patchset didn't seem to help anything?
--
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Messages in current thread:
[RFC PATCH 0/3] Avoid the use of congestion_wait under zon ..., Mel Gorman, (Mon Mar 8, 4:48 am)
[PATCH 1/3] page-allocator: Under memory pressure, wait on ..., Mel Gorman, (Mon Mar 8, 4:48 am)
[PATCH 3/3] vmscan: Put kswapd to sleep on its own waitque ..., Mel Gorman, (Mon Mar 8, 4:48 am)
Re: [PATCH 3/3] vmscan: Put kswapd to sleep on its own wai ..., Nick Piggin, (Tue Mar 9, 3:00 am)
Re: [PATCH 3/3] vmscan: Put kswapd to sleep on its own wai ..., Mel Gorman, (Tue Mar 9, 3:21 am)
Re: [PATCH 3/3] vmscan: Put kswapd to sleep on its own wai ..., Nick Piggin, (Tue Mar 9, 3:32 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Nick Piggin, (Tue Mar 9, 6:35 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Mel Gorman, (Tue Mar 9, 7:17 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Nick Piggin, (Tue Mar 9, 8:03 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Christian Ehrhardt, (Tue Mar 9, 8:42 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Christoph Lameter, (Tue Mar 9, 8:50 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Christian Ehrhardt, (Tue Mar 9, 8:56 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Christoph Lameter, (Tue Mar 9, 9:09 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Mel Gorman, (Tue Mar 9, 10:01 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Christoph Lameter, (Tue Mar 9, 10:11 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Mel Gorman, (Tue Mar 9, 10:30 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Mel Gorman, (Tue Mar 9, 10:35 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Mel Gorman, (Tue Mar 9, 11:22 am)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Nick Piggin, (Tue Mar 9, 7:35 pm)
Re: [PATCH 1/3] page-allocator: Under memory pressure, wai ..., Nick Piggin, (Tue Mar 9, 7:38 pm)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Andrew Morton, (Thu Mar 11, 4:41 pm)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Christian Ehrhardt, (Thu Mar 11, 11:39 pm)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Andrew Morton, (Fri Mar 12, 12:05 am)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Mel Gorman, (Fri Mar 12, 2:09 am)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Mel Gorman, (Fri Mar 12, 3:47 am)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Christian Ehrhardt, (Fri Mar 12, 5:15 am)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Andrew Morton, (Fri Mar 12, 7:37 am)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Mel Gorman, (Mon Mar 15, 5:29 am)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Christian Ehrhardt, (Mon Mar 15, 5:34 am)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Christian Ehrhardt, (Mon Mar 15, 7:45 am)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Andrew Morton, (Mon Mar 15, 1:09 pm)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Mel Gorman, (Tue Mar 16, 3:11 am)
Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under ..., Mel Gorman, (Thu Mar 18, 10:42 am)