Re: [PATCH 02/10] vmscan: move priority variable into scan_control

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi

> Sorry for the long delay on this. I got distracted by the anon_vma and
> page migration stuff.

Sorry for the delay too. I don't have enough development time recently ;)
I had tested this patch series a while. but now they need to rebase and retest. that's sad.

> On Sat, Apr 17, 2010 at 12:48:20AM +0200, Johannes Weiner wrote:
> > On Thu, Apr 15, 2010 at 06:21:35PM +0100, Mel Gorman wrote:
> > > From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
> > > 
> > > Now very lots function in vmscan have `priority' argument. It consume
> > > stack slightly. To move it on struct scan_control reduce stack.
> > 
> > I don't like this much because it obfuscates value communication.
> > 
> > Functions no longer have obvious arguments and return values, as it's all
> > passed hidden in that struct.
> > 
> > Do you think it's worth it?  I would much rather see that thing die than
> > expand on it...
> 
> I don't feel strongly enough to fight about it and reducing stack usage here
> isn't the "fix" anyway. I'll drop this patch for now.

I'm ok either.


> That aside, the page reclaim algorithm maintains a lot of state and the
> "priority" is part of that state. While the struct means that functions might
> not have obvious arguments, passing the state around as arguments gets very
> unwieldly very quickly. I don't think killing scan_control would be as
> nice as you imagine although I do think it should be as small as
> possible.

I don't have strong opinion. I think both you and Hannes were talking correct thing.
But Hannes seems to have more strong opinion. then, I'm tend to drop this one.

Thanks.


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


[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux