2010/7/20 Andreas Gruenbacher <agruen@xxxxxxx>:
> On Sunday 18 July 2010 08:36:59 Wang Sheng-Hui wrote:
>> I regenerated the patch. Please check it.
>
> The logic for calculating how many objects to free is still wrong:
> mb_cache_shrink_fn returns the number of entries scaled by
> sysctl_vfs_cache_pressure / 100. It should also scale nr_to_scan by the
> inverse of that. The sysctl_vfs_cache_pressure == 0 case (never scale) may
> require special attention.
>
> See dcache_shrinker() in fs/dcache.c.
>
> Thanks,
> Andreas
>
Sorry, I haven't found any special attention on
sysctl_vfs_cache_pressure == 0 case or scale
nr_to_scan in fs/dcache.c
900static int shrink_dcache_memory(int nr, gfp_t gfp_mask)
901{
902 if (nr) {
903 if (!(gfp_mask & __GFP_FS))
904 return -1;
905 prune_dcache(nr);
906 }
907 return (dentry_stat.nr_unused / 100) * sysctl_vfs_cache_pressure;
908}
--
Thanks and Best Regards,
shenghui
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