Date: Mon, 18 Apr 2011 18:55:27 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/amd64/amd64 exception.S Message-ID: <201104181855.p3IItaXX029513@repoman.freebsd.org>
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jhb 2011-04-18 18:55:27 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_8)
sys/amd64/amd64 exception.S
Log:
SVN rev 220797 on 2011-04-18 18:55:27Z by jhb
MFC 220430,220431,220452,220460:
If a system call does not request a full interrupt return, use a fast
path via the sysretq instruction to return from the system call. This
resolves most of the performance regression in system call microbenchmarks
between 7 and 8 on amd64.
While here, trim an instruction (and memory access) from the doreti path
and fix a typo in a comment.
Revision Changes Path
1.140.2.12 +37 -4 src/sys/amd64/amd64/exception.S
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