From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9A5E63F20ED for ; Mon, 6 Jul 2026 06:55:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783320936; cv=none; b=u9yoVvs1AyqlSnP0qHMOTFGle0LEplgNYPVYzJxMt3M/qP2Ueyivo/j5Ph8T0ZIoEkeBtNYSK/xqorz0auyuKyVuJiP5N65UpjBo4v3QDfex5v0ksQc0NDONXSefhoBf+OvwujRHA8v7MROtdmJiZ6LWZTNNKYr1hwJYxPi5m8U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783320936; c=relaxed/simple; bh=owGnASfouMygR1Xo+e9GWIQSroUbXuYypHwyFgbkn1E=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=GaQ78JCb8YioEEstNNk7qZMqEikKBjXySwa5F9hRBm2DYqJtdEc6X5/v2gI/4Tmrr+BA70YxKzGNhexOZ3E5j3biCWq4C+xS7ftofz6CcjQbAA/kJ8MEn71ZxuJuOV8EupMa0eahZT2kZ/c+yreBSrJ0Ttcz112H7fRBrLqQ2Bc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OH21rkP7; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OH21rkP7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 58D721F000E9; Mon, 6 Jul 2026 06:55:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783320927; bh=zMtLSNfy7XDiRALlmO3rgrfVc43zWl2hltbEKjLLbGE=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=OH21rkP7GIl56sZQ9WPfrU//nny8/5DsiJ1PFp07qAsF+nlE3V6lubtYUY/4BQTO3 G23eAuBA6pgVtDKeFXSvKmY8m7tSnDItnhZSbUsRNwlzx+Ql1I5PrmM9pNzhXyEFg8 p1ELHg7Y78AxZtWLZ4Cew1OdUd3U2HlFCXOTF8j/2lUejKHY3PGqgsHFw/1wMxD9cz qZL9rrwzowQvMzqG8+phXkYTXvaftoqNjgC67+3NnTYhKMVWIZGOxUYoM9U6OUOJv6 Ryh18ZvCD9O3TxE1ZUqfNJakt3cfOt/fQG/amw9ansHOskm6OmeM6GSGirhiNHnuS3 umrIJIL5PUnIw== Message-ID: Date: Mon, 6 Jul 2026 08:55:23 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 3/3] ksm: add mremap selftests for ksm_rmap_walk To: xu.xin16@zte.com.cn, akpm@linux-foundation.org Cc: chengming.zhou@linux.dev, hughd@google.com, wang.yaxin@zte.com.cn, linux-mm@kvack.org, linux-kernel@vger.kernel.org, ljs@kernel.org References: <20260703162637070FU4ekl58Hw_Z7OSuJryZB@zte.com.cn> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/3/26 10:26, xu.xin16@zte.com.cn wrote: > From: xu xin > > The existing tools/testing/selftests/mm/rmap.c has already one testcase > for ksm_rmap_walk in TEST_F(migrate, ksm), which takes use of migration > of page from one NUMA node to another NUMA node. However, it just lacks > the scenario of mremapped VMAs. > > We add the calling of mremap() and then trigger KSM to merge pages before > migrating, which is specifically to test an optimization which is > introduced by this patch ("ksm: Optimize rmap_walk_ksm by passing a > suitable address pgoff"). > > This test can reproduce the issue that Hugh points out at > https://lore.kernel.org/all/02e1b8df-d568-8cbb-b8f6-46d5476d9d75@google.com/ > > Signed-off-by: xu xin > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David