Re: [PATCH RFC] vmalloc: eagerly clear ptes on vunmap

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From: Andrew Morton

Subject: Re: [PATCH RFC] vmalloc: eagerly clear ptes on vunmap

Date: Tuesday, November 30, 2010 - 5:29 pm

On Mon, 29 Nov 2010 12:32:11 -0800
Jeremy Fitzhardinge <jeremy@goop.org> wrote:

quoted text> When unmapping a region in the vmalloc space, clear the ptes immediately.
> There's no point in deferring this because there's no amortization
> benefit.
> 
> The TLBs are left dirty, and they are flushed lazily to amortize the
> cost of the IPIs.
> 
> This specific motivation for this patch is a regression since 2.6.36 when
> using NFS under Xen, triggered by the NFS client's use of vm_map_ram()
> introduced in 56e4ebf877b6043c289bda32a5a7385b80c17dee.  XFS also uses
> vm_map_ram() and could cause similar problems.
> 

Do we have any quantitative info on that regression?  The patch fixed
it, I assume?

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Messages in current thread:

Could we do immediate pte zaps in vunmap?, Jeremy Fitzhardinge, (Fri Nov 26, 1:10 am)

Re: Could we do immediate pte zaps in vunmap?, Nick Piggin, (Sat Nov 27, 3:36 am)

[PATCH RFC] vmalloc: eagerly clear ptes on vunmap, Jeremy Fitzhardinge, (Mon Nov 29, 1:32 pm)

Re: [PATCH RFC] vmalloc: eagerly clear ptes on vunmap, Nick Piggin, (Tue Nov 30, 5:42 am)

Re: [PATCH RFC] vmalloc: eagerly clear ptes on vunmap, Jeremy Fitzhardinge, (Tue Nov 30, 10:45 am)

Re: [PATCH RFC] vmalloc: eagerly clear ptes on vunmap, Andrew Morton, (Tue Nov 30, 5:29 pm)

Re: [PATCH RFC] vmalloc: eagerly clear ptes on vunmap, Jeremy Fitzhardinge, (Tue Nov 30, 8:09 pm)

Re: [PATCH RFC] vmalloc: eagerly clear ptes on vunmap, Andrew Morton, (Tue Nov 30, 8:23 pm)

Re: [PATCH RFC] vmalloc: eagerly clear ptes on vunmap, Jeremy Fitzhardinge, (Wed Dec 1, 1:16 am)


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