---372782664-1839306446-932450807=:2584
Content-Type: TEXT/PLAIN; charset=US-ASCII
Hello Ingo et al,
Attached is a patch against 2.3.11-5 (sorry about CVS -- eagerly awaiting
BitKeeper) that fixes what I think are major problems with the lazy tlb
code for x86 (for non-x86 people, please note the added
(get|put)_mmu_context and how SET_PAGE_DIR does the equivelent to a
put_mmu_context): using mmget/put isn't a wise thing in schedule, in my
opinion, as the mm context could retain quite a few resources until the
last put. Also, by incrementing mm->count, many optimizations were being
disabled, even if they're still valid (the assumption I'm working on here
is that the kernel mappings for pgds to pmds is done at boot time and
never changed; any access of any other part of the pgd my a lazy tlb task
is wholly invalid).
The mm_struct leak fix is based on the fix pointed out by Alexander Viro
(once I saw his message pointing out the actual bug, the rest came easy --
thanks Alex!): put_mmu_context is moved to schedule_tail. I'm no longer
seeing the bad pmd messages as task->mm is no longer changed on lazy tlb
processes, so Alexander's patch for fixing task_struct->mm references
isn't needed.
With these fixes, things *almost* worked, except something was freeing
random pages, resulting in massive page cache corruption (2.3.11-[45] are
DANGEROUS, and have resulted in some minor data trashing here). It turns
out that __switch_to wasn't preserving prev in %eax -- fixed by returning
prev from __switch_to. While I was at it, I made schedule_tail a FASTCALL
(code is okay with gcc 2.7.2) since the value of interest was already in
%eax.
Phew! Many thanks to Ingo for laying out the groundwork.
-ben
-- Hi! I'm Signature Virus 99! Copy me into your .signature and join the fun!---372782664-1839306446-932450807=:2584 Content-Type: TEXT/PLAIN; charset=US-ASCII; name="lazy-tlb-3.diff" Content-Transfer-Encoding: BASE64 Content-ID: <Pine.LNX.3.96.990720020647.2584B@mole.spellcast.com> Content-Description:
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