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SubjectRe: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys_msync()
2008/1/23, Miklos Szeredi <miklos@szeredi.hu>:
> > > Also, it still doesn't make sense to me why we'd not need to walk the
> > > rmap, it is all the same file after all.
> >
> > It's the same file, but not the same memory map. It basically depends
> > on how you define msync:
> >
> > a) sync _file_ on region defined by this mmap/start/end-address
> > b) sync _memory_region_ defined by start/end-address
>
> My mmap/msync tester program can acually check this as well, with the
> '-f' flag. Anton, can you try that on the reference platforms?

Here it is:

$ ./a.out file -f
begin 1201085546 1201085546 1200956936
write 1201085546 1201085546 1200956936
mmap 1201085546 1201085546 1200956936
b 1201085546 1201085546 1200956936
msync b 1201085550 1201085550 1200956936
c 1201085550 1201085550 1200956936
msync c 1201085552 1201085552 1200956936
d 1201085552 1201085552 1200956936
munmap 1201085552 1201085552 1200956936
close 1201085555 1201085555 1200956936
sync 1201085555 1201085555 1200956936
$ ./a.out file -sf
begin 1201085572 1201085572 1200956936
write 1201085572 1201085572 1200956936
mmap 1201085572 1201085572 1200956936
b 1201085572 1201085572 1200956936
msync b 1201085576 1201085576 1200956936
c 1201085576 1201085576 1200956936
msync c 1201085578 1201085578 1200956936
d 1201085578 1201085578 1200956936
munmap 1201085578 1201085578 1200956936
close 1201085581 1201085581 1200956936
sync 1201085581 1201085581 1200956936
$ uname -a
FreeBSD td152.testdrive.hp.com 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Fri
Jan 12 11:05:30 UTC 2007
root@dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/SMP i386
$

>
> Miklos
>


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