Re: [patch] truncate_inode_pages

[Dieter Nützel]

> Daniel Phillips wrote:
> > 
> > This is easy, just set the list head to the page about to be truncated.
>
> Works for me.
>
> --- linux-2.4.5/mm/filemap.c    Mon May 28 13:31:49 2001
> +++ linux-akpm/mm/filemap.c     Sun Jun 10 11:29:19 2001
> @@ -235,12 +235,13 @@

[snip]

Works for me 12 times faster on my Athlon 550 and ReiserFS.

System:

Athlon 550 (old one, 0.25 µm)
MSI MS-6167 Rev 1.0B (Irongate C4)
320 MB SDRAM PC100-2-2-2
AHA-2940UW
IBM DDYS-T18350N 18 GB (UW/U160)
Kernel 2.4.5-ac12
Glibc-2.2 (SuSE 7.1)

SunWave1>cat /proc/version
Linux version 2.4.5-ac12 (root@SunWave1) (gcc version 2.95.2 19991024 
(release)) #1 Sat Jun 9 17:41:07 CEST 2001
 
SunWave1>time ./ftruncate
0.430u 54.790s 1:00.09 91.8%    0+0k 0+0io 32887pf+0w
 
With the mm/filemap.c fix:
 
SunWave1>cat /proc/version
Linux version 2.4.5-ac12 (root@SunWave1) (gcc version 2.95.2 19991024 
(release)) #1 Sun Jun 10 22:49:07 CEST 2001
 
SunWave1>time ./ftruncate
0.220u 1.670s 0:05.13 36.8%     0+0k 0+0io 32852pf+0w

Thanks,
	Dieter