Date: Thu, 15 Jul 2010 16:25:51 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/amd64/amd64 pmap.c Message-ID: <201007151626.o6FGQFAK065763@repoman.freebsd.org>
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alc 2010-07-15 16:25:51 UTC
FreeBSD src repository
Modified files:
sys/amd64/amd64 pmap.c
Log:
SVN rev 210124 on 2010-07-15 16:25:51Z by alc
Optimize pmap_remove()'s handling of PG_G mappings. Specifically,
instead of calling pmap_invalidate_page() for each PG_G mapping, call
pmap_invalidate_range() for each range of PG_G mappings. In addition,
eliminate a redundant call to pmap_invalidate_page(). Both
pmap_remove_pte() and pmap_remove_page() called pmap_invalidate_page()
when the mapping had the PG_G attribute. Now, only pmap_remove_page()
calls pmap_invalidate_page(). Altogether, these changes eliminate 53%
of the TLB shootdowns for a "buildworld" on a ZFS file system. On
FFS, the reduction is 3%.
MFC after: 6 weeks
Revision Changes Path
1.709 +15 -14 src/sys/amd64/amd64/pmap.c
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