linux-kernel - Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys

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Message-ID: <4df4ef0c0801230509w5c6cd1a5m35fb30b51462da4d@mail.gmail.com>
Date:	Wed, 23 Jan 2008 16:09:11 +0300
From:	"Anton Salikhmetov" <salikhmetov@...il.com>
To:	"Miklos Szeredi" <miklos@...redi.hu>
Cc:	a.p.zijlstra@...llo.nl, linux-mm@...ck.org, jakob@...hought.net,
	linux-kernel@...r.kernel.org, valdis.kletnieks@...edu,
	riel@...hat.com, ksm@...dk, staubach@...hat.com,
	jesper.juhl@...il.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, protasnb@...il.com,
	r.e.wolff@...wizard.nl, hidave.darkstar@...il.com,
	hch@...radead.org
Subject: Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys_msync()

2008/1/23, Miklos Szeredi <miklos@...redi.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@...sler.cse.buffalo.edu:/usr/obj/usr/src/sys/SMP  i386
$

>
> Miklos
>
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