linux-kernel - Re: [PATCH 6/11] ksm: remove old stable nodes more thoroughly

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Date:	Sun, 27 Jan 2013 20:19:28 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Simon Jeons <simon.jeons@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Petr Holasek <pholasek@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Izik Eidus <izik.eidus@...ellosystems.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 6/11] ksm: remove old stable nodes more thoroughly

On Sun, 27 Jan 2013, Simon Jeons wrote:
> On Fri, 2013-01-25 at 18:01 -0800, Hugh Dickins wrote:
> > Switching merge_across_nodes after running KSM is liable to oops on stale
> > nodes still left over from the previous stable tree.  It's not something
> 
> Since this patch solve the problem, so the description of
> merge_across_nodes(Value can be changed only when there is no ksm shared
> pages in system) should be changed in this patch.

No.

The code could be changed to unmerge_and_remove_all_rmap_items()
automatically whenever merge_across_nodes is changed; but that's
not what Petr chose to do, and I didn't feel strongly to change it.
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