Date: Fri, 06 Jun 2008 19:11:21 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Alan Cox <alc@FreeBSD.org> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/vm vm_page.c Message-ID: <1809.1212779481@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 06 Jun 2008 18:38:43 GMT." <200806061838.m56Icu2E074642@repoman.freebsd.org>
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In message <200806061838.m56Icu2E074642@repoman.freebsd.org>, Alan Cox writes: >alc 2008-06-06 18:38:43 UTC > > FreeBSD src repository > > Modified files: > sys/vm vm_page.c > Log: > SVN rev 179623 on 2008-06-06 18:38:43Z by alc > > Essentially, neither madvise(..., MADV_DONTNEED) nor madvise(..., MADV_FREE) > work. (Moreover, I don't believe that they have ever worked as intended.) I remember they did have a measurable but minor impact on performance in systems which paged a lot, back when they were introduced, sort of 1995-ish. But with the subsequent plunge in RAM prices they never saw much use. Thanks for fixing them. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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