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X-CSE-ConnectionGUID: 4Wc8u5ThTJC7480YNlaQSg== X-CSE-MsgGUID: RZfwar7nQYO4o4f3iD9SJw== X-IronPort-AV: E=McAfee;i="6700,10204,11373"; a="43191709" X-IronPort-AV: E=Sophos;i="6.14,246,1736841600"; d="scan'208";a="43191709" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2025 14:34:20 -0700 X-CSE-ConnectionGUID: jP9meFiCRcmEnUNIa0NPLQ== X-CSE-MsgGUID: RbjKNXj7Tvq6Y3miW/XdcQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.14,246,1736841600"; d="scan'208";a="122116800" Received: from dnelso2-mobl.amr.corp.intel.com (HELO [10.125.108.212]) ([10.125.108.212]) by fmviesa009-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2025 14:34:19 -0700 Message-ID: <8f757efce4efd600c2c49975f5ef8298c1ff5f4f.camel@linux.intel.com> Subject: Re: [PATCH 6/9] mm: swap: drop last SWAP_MAP_SHMEM flag in batch in swap_entries_put_nr() From: Tim Chen To: Kemeng Shi , akpm@linux-foundation.org Cc: kasong@tencent.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Date: Fri, 14 Mar 2025 14:34:18 -0700 In-Reply-To: <20250313210515.9920-7-shikemeng@huaweicloud.com> References: <20250313210515.9920-1-shikemeng@huaweicloud.com> <20250313210515.9920-7-shikemeng@huaweicloud.com> Autocrypt: addr=tim.c.chen@linux.intel.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2025-03-14 at 05:05 +0800, Kemeng Shi wrote: > The SWAP_MAP_SHMEM indicates last map from shmem. Therefore we can drop > SWAP_MAP_SHMEM in batch in similar way to drop last 1 flag in batch. >=20 > Signed-off-by: Kemeng Shi Reviewed-by: Tim Chen > --- > mm/swapfile.c | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) >=20 > diff --git a/mm/swapfile.c b/mm/swapfile.c > index 0ce0ca08594e..2d0f5d630211 100644 > --- a/mm/swapfile.c > +++ b/mm/swapfile.c > @@ -192,7 +192,7 @@ static bool swap_is_last_map(struct swap_info_struct = *si, > unsigned char *map_end =3D map + nr_pages; > unsigned char count =3D *map; > =20 > - if (swap_count(count) !=3D 1) > + if (swap_count(count) !=3D 1 && swap_count(count) !=3D SWAP_MAP_SHMEM) > return false; > =20 > while (++map < map_end) { > @@ -1497,7 +1497,10 @@ static bool swap_entries_put_nr(struct swap_info_s= truct *si, > unsigned char count; > int i; > =20 > - if (nr <=3D 1 || swap_count(data_race(si->swap_map[offset])) !=3D 1) > + if (nr <=3D 1) > + goto fallback; > + count =3D swap_count(data_race(si->swap_map[offset])); > + if (count !=3D 1 && count !=3D SWAP_MAP_SHMEM) > goto fallback; > /* cross into another cluster */ > if (nr > SWAPFILE_CLUSTER - offset % SWAPFILE_CLUSTER)