From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793715006; b=x1cgd7MgUBKsS2hntrSKBGeTuhB3NLZkTmqzro789jVikwBnigp9vCF6oOF/tHGW2OVu jRUug7YvReuLtzbo5RCufMTdiTNqoihrkHWNg+c4rbJ3Xt9nC/znNYBfIh0lPgmueedN0 sq4DveH5NjQIYD3sXNeqlPMjbXpfC07SzNEqd+7dk12mloZi6pyaMMAtCNOsXe4k/8N2K l8gt7916czqnGVU4JbIdUuFukiLv5MJ0FXgyavas3JnRt65rEkCc56C91qEpLu3hj0+25 +iwFSbegqxtFe306+cTFqRYpiGlGpqm26ofazO1NWkMF7dXIPWTYSxFTd69OlFSErAQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793715006; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=qzg8QxS/frlrk57hvLDahMynox2KuT4SpVk1LZUW0TE=; b=0cMYdWctWZrtmhPLBU2vLmlWHjBm3xPZiFKX4tzcPzNA2cNLV2gpH+cmEG8pfVNaOlXl Kw9A8GK5Ov5g5tzeHnKu5wfCKaHGeuffjv5PyeJ4Vpe7IEVGnW66GwhLqtiC7mY9bQ90v 2dUZGSQIXrPIvcraEZCu/VBFnidHZ86HnUv1bM9Tmj8pX/8oIeU/oAin7TA30dSE/roTJ T7/ka6HrKqRWGnYcRL2PmXQ1/Hl0pImrFqtB09MavVNJsNRspgkRGZQH0Yh4mJtxfPOPV zmEin5pjjKuHa5Z4i+6p2d+na6SAGRrXGOjOq5NLvaTHAZPb/PWUZgptczMb70OuSCQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=KYhaKxjT; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DF98F606A334; Tue, 3 Nov 2026 14:10:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=KYhaKxjT Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A6821F000C1; Tue, 3 Nov 2026 14:10:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793715005; bh=qzg8QxS/frlrk57hvLDahMynox2KuT4SpVk1LZUW0TE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=KYhaKxjTGsgSF1PMtP9Gf1F86pV97/YQAze1GGUjGnXWkBFnXZK2xehoeEfPmzJOg USZTxpFDj+mszdLE28PC+I8ZGzOr61vyVArCCUu3jehaqD9R3vorJrbf96S44NYHAM 2xs+INVT7guNgPWZuXUSXufObBs8J5RE5ZNUIQEBpMelI+cVrukICzVjIbv1oxMI+F SjAOLIXCTaw3N80xQe1x1abSxVxXx36s2pOLUQqO3Dat3E9fuAnPD+WOFLCa/vCZF4 RBFNtDDSnU3xKWmkw72KUcgirP009qCstdh7psQZWr48PBiB4Qv80Sm9S5X99DY10+ OCK8d/k+PFWcg== From: SJ Park To: SJ Park , Andrew Morton Cc: Aveline Noir , Bijan Tabatabai , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 5/9] mm/damon/{p,v}addr: skip folios already on the migration target node Date: Tue, 3 Nov 2026 06:09:57 -0800 Message-ID: <20261103140958.115634-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261102150757.93058-6-sj@kernel.org> References: X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Mon, 2 Nov 2026 07:07:52 -0800 SJ Park wrote: > From: Aveline Noir > > While measuring DAMOS migration overhead, I found that the target_nid > path isolates folios already on the target node, then puts them back on > the LRU without migrating them. > > Skip them before isolation in vaddr and paddr, as the vaddr explicit > destinations path already does. > > In a synthetic same-node fvaddr test on a two-node x86-64 KVM guest (8 > interleaved runs per kernel), guest-kernel cycles fell by about 29% with > 4 KiB regions and 90% with 16 MiB regions. Median kdamond CPU time fell > by about 76% with 16 MiB regions, with no clear change with 4 KiB > regions. > > Cc: Bijan Tabatabai > Signed-off-by: Aveline Noir > Signed-off-by: SJ Park Somehow I dropped my R-b, sorry. Andrew, could you please add below? Reviewed-by: SJ Park Thanks, SJ [...]