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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: Dirty/Access bits vs. page content
Date: Fri, 25 Apr 2014 11:37:26 +1000
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On Thu, 2014-04-24 at 16:46 -0700, Linus Torvalds wrote:
> - we do the TLB shootdown holding the page table lock (but that's not
> new - ptep_get_and_flush does the same
> 

The flip side is that we do a lot more IPIs for large invalidates,
since we drop the PTL on every page table page.

Ben.


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Subject: Re: Dirty/Access bits vs. page content
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 25 Apr 2014 11:37:26 +1000
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On Thu, 2014-04-24 at 16:46 -0700, Linus Torvalds wrote:
> - we do the TLB shootdown holding the page table lock (but that's not
> new - ptep_get_and_flush does the same
> 

The flip side is that we do a lot more IPIs for large invalidates,
since we drop the PTL on every page table page.

Ben.