Date: Sat, 24 Apr 2004 13:53:55 -0700 (PDT) From: Alan Cox <alc@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/alpha/alpha pmap.c src/sys/pci agp.c agp_i810.c src/sys/vm vm_kern.c vm_page.c Message-ID: <200404242053.i3OKrtFl013093@repoman.freebsd.org>
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alc 2004/04/24 13:53:55 PDT
FreeBSD src repository
Modified files:
sys/alpha/alpha pmap.c
sys/pci agp.c agp_i810.c
sys/vm vm_kern.c vm_page.c
Log:
Push down the responsibility for zeroing a physical page from the
caller to vm_page_grab(). Although this gives VM_ALLOC_ZERO a
different meaning for vm_page_grab() than for vm_page_alloc(), I feel
such change is necessary to accomplish other goals. Specifically, I
want to make the PG_ZERO flag immutable between the time it is
allocated by vm_page_alloc() and freed by vm_page_free() or
vm_page_free_zero() to avoid locking overheads. Once we gave up on
the ability to automatically recognize a zeroed page upon entry to
vm_page_free(), the ability to mutate the PG_ZERO flag became useless.
Instead, I would like to say that "Once a page becomes valid, its
PG_ZERO flag must be ignored."
Revision Changes Path
1.144 +0 -3 src/sys/alpha/alpha/pmap.c
1.39 +0 -2 src/sys/pci/agp.c
1.28 +0 -2 src/sys/pci/agp_i810.c
1.116 +0 -2 src/sys/vm/vm_kern.c
1.280 +2 -0 src/sys/vm/vm_page.c
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