Marcelo Tosatti wrote:
Err, I'm on crack. The assumption is that the common case is pte
invalidation + invlpg: kunmap_atomic, page aging clearing the
accessed bit, page reclaim.
Linux COW will invalidate + invlpg (do_wp_page) first:
entry = mk_pte(new_page, vma->vm_page_prot);
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
/*
* Clear the pte entry and flush it first, before
* updating the
* pte with the new entry. This will avoid a race
* condition
* seen in the presence of one thread doing SMC and
* another
* thread doing COW.
*/
ptep_clear_flush_notify(vma, address, page_table);
Not sure about Windows.
Okay, so Linux won't win on this. But is there any downside, apart from
fetching the pte and reestablishing the spte?
--
error compiling committee.c: too many arguments to function
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