Date: Sat, 12 May 2001 10:21:28 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Rik van Riel <riel@conectiva.com.br> Cc: arch@freebsd.org, linux-mm@kvack.org, sfkaplan@cs.amherst.edu Subject: Re: on load control / process swapping Message-ID: <200105121721.f4CHLSS18553@earth.backplane.com> References: <Pine.LNX.4.21.0105121109210.5468-100000@imladris.rielhome.conectiva>
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:
:Ahhh, so FreeBSD _does_ have a maxscan equivalent, just one that
:only kicks in when the system is under very heavy memory pressure.
:
:That explains why FreeBSD's thrashing detection code works... ;)
:
:(I'm not convinced, though, that limiting the speed at which we
:scan the active list is a good thing. There are some arguments
:in favour of speed limiting, but it mostly seems to come down
:to a short-cut to thrashing detection...)
Note that there is a big distinction between limiting the page
queue scan rate (which we do not do), and sleeping between full
scans (which we do). Limiting the page queue scan rate on a
page-by-page basis does not scale. Sleeping in between full queue
scans (in an extreme case) does scale.
-Matt
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