Date: Mon, 7 Jun 2004 23:51:21 +0000 (UTC) From: Peter Wemm <peter@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/amd64/amd64 pmap.c Message-ID: <200406072351.i57NpLUS064185@repoman.freebsd.org>
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peter 2004-06-07 23:51:20 UTC
FreeBSD src repository
Modified files:
sys/amd64/amd64 pmap.c
Log:
Fix a serious problem that manifested during swap, and a few other times.
pmap_remove() would be called with a huge range and we'd stride across
it in only 2MB chunks. This would manifest as massive cpu time and a
largely unresponsive system during hard swap. Instead, check the higher
page directories which means we can run pmap_remove() in just a few
hundred loop iterations instead of millions since we can process
address space in chunks of 512GB and 1GB as well as 2MB.
Eternal thanks to: tmm
Revision Changes Path
1.462 +60 -18 src/sys/amd64/amd64/pmap.c
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