lkml.org 
[lkml]   [2012]   [Oct]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2] mm: thp: Set the accessed flag for old pages on access fault.
On Tue, Oct 23, 2012 at 10:50:27PM +0100, Andrew Morton wrote:
> On Tue, 23 Oct 2012 11:11:25 +0100
> Will Deacon <will.deacon@arm.com> wrote:
> > This patch ("mm: thp: Set the accessed flag for old pages on access fault")
> > doesn't depend on "ARM: mm: Transparent huge page support for LPAE systems"
> > because currently transparent huge pages cannot be enabled for ARM in
> > mainline (or linux-next). update_mmu_cache_pmd is only called from
> > mm/huge_memory.c, which depends on CONFIG_TRANSPARENT_HUGEPAGE=y.
> >
> > As for the new huge_pmd_set_accessed function... there's a similar situation
> > for the do_huge_pmd_wp_page function: it's called from mm/memory.c but is
> > only defined in mm/huge_memory.c. Looks like the compiler optimises those
> > calls away because pmd_trans_huge and friends constant-fold to 0.
>
> Ah, OK.
>
> "mm: thp: Set the accessed flag for old pages on access fault" clashes
> in a non-trivial way with linux-next changes, due to the sched-numa
> changes (sigh). This is a problem for me, because I either need to
> significantly alter your patch (so it isn't applicable to mainline) or
> I need to stage your patch ahead of linux-next, then fix up linux-next
> every day after I've pulled and re-merged it.
>
> I'm unsure what your timing is. Can you carry "mm: thp: Set the
> accessed flag for old pages on access fault" until either the whole
> patchset is ready to merge or until the sched-numa situation has been
> cleared up?

I think DaveM may want this patch for sparc, so I'll keep it separate from
the ARM patches and have a go at reworking it when the sched-numa stuff has
settled down. Is that all in linux-next btw? If so, I can use that as a
starting point to dealing with the mess.

Cheers,

Will


\
 
 \ /
  Last update: 2012-10-24 12:01    [W:0.088 / U:0.460 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site