linux-kernel - Re: [PATCH v2 1/3] mm: softdirty: enable write notifications on VMAs after VM

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Date:	Sat, 23 Aug 2014 20:55:17 -0400
From:	Peter Feiner <pfeiner@...gle.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Jamie Liu <jamieliu@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 1/3] mm: softdirty: enable write notifications on VMAs
 after VM_SOFTDIRTY cleared

On Sun, Aug 24, 2014 at 02:50:58AM +0300, Kirill A. Shutemov wrote:
> One more case to consider: mprotect() which doesn't trigger successful
> vma_merge() will not set VM_SOFTDIRTY and will not enable write-protect on
> the vma.
> 
> It's probably better to take VM_SOFTDIRTY into account in
> vma_wants_writenotify() and re-think logic in other corners.

Merge or not, write notifications get disabled! I'll fix this too :-)

Peter
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