Date: Sat, 11 Dec 1999 19:19:34 -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 vfs_syscalls.c src/sys/vm vm_fault.c vm_map.c vm_map.h vm_mmap.c vm_object.c vm_object.h vm_page.c vm_page.h src/sys/sys mman.h src/lib/libc/sys madvise.2 mmap.2 Message-ID: <199912120319.TAA09441@freefall.freebsd.org>
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dillon 1999/12/11 19:19:33 PST
Modified files:
sys/kern vfs_subr.c vfs_syscalls.c
sys/vm vm_fault.c vm_map.c vm_map.h vm_mmap.c
vm_object.c vm_object.h vm_page.c
vm_page.h
sys/sys mman.h
lib/libc/sys madvise.2 mmap.2
Log:
Add MAP_NOSYNC feature to mmap(), and MADV_NOSYNC and MADV_AUTOSYNC to
madvise().
This feature prevents the update daemon from gratuitously flushing
dirty pages associated with a mapped file-backed region of memory. The
system pager will still page the memory as necessary and the VM system
will still be fully coherent with the filesystem. Modifications made
by other means to the same area of memory, for example by write(), are
unaffected. The feature works on a page-granularity basis.
MAP_NOSYNC allows one to use mmap() to share memory between processes
without incuring any significant filesystem overhead, putting it in
the same performance category as SysV Shared memory and anonymous memory.
Reviewed by: julian, alc, dg
Revision Changes Path
1.239 +2 -2 src/sys/kern/vfs_subr.c
1.147 +3 -2 src/sys/kern/vfs_syscalls.c
1.108 +17 -3 src/sys/vm/vm_fault.c
1.184 +16 -3 src/sys/vm/vm_map.c
1.52 +3 -2 src/sys/vm/vm_map.h
1.105 +5 -4 src/sys/vm/vm_mmap.c
1.171 +32 -5 src/sys/vm/vm_object.c
1.62 +4 -3 src/sys/vm/vm_object.h
1.147 +8 -4 src/sys/vm/vm_page.c
1.74 +5 -5 src/sys/vm/vm_page.h
1.27 +4 -1 src/sys/sys/mman.h
1.16 +28 -1 src/lib/libc/sys/madvise.2
1.18 +30 -1 src/lib/libc/sys/mmap.2
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