Date: Thu, 31 Jan 2002 10:51:49 -0800 (PST) From: Matt Dillon <dillon@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern vfs_subr.c Message-ID: <200201311851.g0VIpne43133@freefall.freebsd.org>
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dillon 2002/01/31 10:51:48 PST
Modified files: (Branch: RELENG_4)
sys/kern vfs_subr.c
Log:
MFC new vlrureclaim trigger-point code. vlrureclaim()'s purpose in life is
to maintain kern.maxvnodes, not to try to free memory. In fact, the reclaim
code is generally called when there is lots of memory available but the
system has too many vnodes. So we can safely skip vnodes which still have
a large number of resident pages present and thereby avoid unnecessary
flushes (e.g. for Yahoo, potentially nasty flushes of MAP_NOSYNC pages).
We calculate a resident count that guarentees we will still be able to
locate enough vnodes to reclaim to satisfy kern.maxvnodes.
MFC new vlruvp() procedure, which is currently a NOP. We will be able to
utilize this procedure after we've cleaned up the filesystem SYNCing code.
Right now SYNC becomes wildly inefficient if the vlruvp() code is enabled.
Revision Changes Path
1.249.2.24 +44 -0 src/sys/kern/vfs_subr.c
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