Re: 2.4.25 - large inode_cache

[Andreas Dilger]

On Feb 26, 2004  11:23 -0300, Marcelo Tosatti wrote:
> On Thu, 26 Feb 2004, Jakob Oestergaard wrote:
> > On Thu, Feb 26, 2004 at 10:08:23AM -0300, Marcelo Tosatti wrote:
> > > This should be normal behaviour -- the i/d caches grew because of file
> > > system activitity. This memory will be reclaimed in case theres pressure.
> >
> > But how is "pressure" defined?
> >
> > Will a heap of busy knfsd processes doing reads or writes exert
> > pressure?   Or is it only local userspace that can pressurize the VM (by
> > either anonymously backed memory or file I/O).
> 
> Any allocator will cause VM pressure.

But won't all of the knfsd allocations be by necessity GFP_NOFS to avoid
deadlocks, so they will be unable to clear inodes or dentries?  Both
shrink_icache_memory() and shrink_dcache_memory() do nothing if __GFP_FS
isn't set so if there is no user-space allocation pressure we will never
get into the dcache/icache freeing paths from knfsd allocations.

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/