linux-kernel - Re: [RFC] Reverting NUMA-affine page table allocation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20110302161900.GP3319@htj.dyndns.org>
Date:	Wed, 2 Mar 2011 17:19:00 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Reverting NUMA-affine page table allocation

Hey, Yinghai.

On Tue, Mar 01, 2011 at 02:41:55PM -0800, Yinghai Lu wrote:
> > 2. find_early_table_space() always calculates the amount of the needed
> >   space from 0 to the specified @end.  As nodes are registered, each
> >   node would try to allocate accumulative amount of space for page
> >   table.  This probably wouldn't cause any actual problem (may affect
> >   emulated configurations a bit tho).
> 
> interesting.

Yeah, it's a pretty interesting piece of code in need of some cleanup.

I'm reverting the NUMA-affine page table allocation for now.  I wish
something like the following happens during the next devel cycle.

* General cleanup of page table allocation code.  I'm not talking
  about major rewrite or anything major.  Just making the code sane(r)
  so that they take parameters instead of doing subtle stuff with
  internal #ifdef's.  And hopefully proper documentation.

* Redo the NUMA-affine page table allocation in simpler way using
  cleaned up allocation functions.  As suggested before, IMO, just
  taking top and bottom of nodes is enough.  Again, hopefully, with
  enough documentation on both what and why.

If you're interested in doing the above, please go ahead and let me
know.

Thank you.

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