Messages in this thread | | | Date | Tue, 25 Feb 2003 10:04:38 -0800 | From | William Lee Irwin III <> | Subject | Re: Minutes from Feb 21 LSE Call |
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On Tue, Feb 25, 2003 at 09:43:59AM -0800, William Lee Irwin III wrote: >> The pagetable cache is gone in 2.5, so pte_alloc_one() takes the >> bitblitting hit for pagetables.
On Tue, Feb 25, 2003 at 06:59:28PM +0100, Andrea Arcangeli wrote: > I'm talking about do_anonymous_page, do_wp_page, do_no_page fork and all > the other places that introduces spinlocks (per-page) and allocations of > 2 pieces of ram rather than just 1 (and in turn potentially global > spinlocks too if the cpu-caches are empty). Just grep for > pte_chain_alloc or page_add_rmap in mm/memory.c, that's what I mean, I'm > not talking about pagetables.
Well, pte_alloc_one() has a clear explanation.
The fact that the rmap accounting is not free is not news.
For anonymous pages performing the analogous vma-based lookup as with Dave McCracken's patch for file-backed pages would require a significant anonymous page accounting rework.
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