Re: x86 ptep_get_and_clear question

[Ben LaHaise]

On Fri, 16 Feb 2001, Manfred Spraul wrote:

> That leaves msync() - it currently does a flush_tlb_page() for every
> single dirty page.
> Is it possible to integrate that into the mmu gather code?
>
> tlb_transfer_dirty() in addition to tlb_clear_page()?

Actually, in the filemap_sync case, the flush_tlb_page is redundant --
there's already a call to flush_tlb_range in filemap_sync after the dirty
bits are cleared.  None of the cpus we support document having a writeback
tlb, and intel's docs explicitely state that they do not as they state
that the dirty bit is updated on the first write to dirty the pte.

                -ben

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