Eric Dumazet wrote:
On Wed, 04 Apr 2007 20:05:54 +1000
Nick Piggin <[EMAIL PROTECTED]> wrote:
@@ -1638,7 +1652,7 @@ find_extend_vma(struct mm_struct * mm, u
unsigned long start;
addr &= PAGE_MASK;
- vma = find_vma(mm,addr);
+ vma = find_vma(mm,addr,¤t->vmacache);
if (!vma)
return NULL;
if (vma->vm_start <= addr)
So now you can have current calling find_extend_vma on someone else's mm
but using their cache. So you're going to return current's vma, or current
is going to get one of mm's vmas in its cache :P
This was not a working patch, just to throw the idea, since the answers I got
showed I was not understood.
In this case, find_extend_vma() should of course have one struct vm_area_cache
* argument, like find_vma()
One single cache on one mm is not scalable. oprofile badly hits it on a dual
cpu config.
Oh, what sort of workload are you using to show this? The only reason that I
didn't submit my thread cache patches was that I didn't show a big enough
improvement.
--
SUSE Labs, Novell Inc.
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