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Tue, 3 Jan 2023 16:28:35 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas1p3.samsung.com (KnoxPortal) with ESMTPA id 20230103072834epcas1p3441ef50a6cc26ac48d184f1244b76a0e~2u_eVYf7n3260832608epcas1p37; Tue, 3 Jan 2023 07:28:34 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20230103072834epsmtrp269cd492211b8bf6d96c6ed818ec8bea8~2u_eUhUhJ3213832138epsmtrp2W; Tue, 3 Jan 2023 07:28:34 +0000 (GMT) X-AuditID: b6c32a35-f09ff70000014e05-16-63b3d923ad9c Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id 79.F5.10542.229D3B36; Tue, 3 Jan 2023 16:28:34 +0900 (KST) Received: from jaewon-linux.10.32.193.11 (unknown [10.253.100.104]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20230103072834epsmtip169b02d5592f8a4c123b73b41a729f122~2u_eIA3g80565105651epsmtip1i; Tue, 3 Jan 2023 07:28:34 +0000 (GMT) From: Jaewon Kim To: riel@redhat.com, redkoi@virtuozzo.com, akpm@linux-foundation.org, hannes@cmpxchg.org, mhocko@kernel.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, jaewon31.kim@gmail.com, Jaewon Kim Subject: [PATCH] page_alloc: avoid the negative free for meminfo available Date: Tue, 3 Jan 2023 16:28:07 +0900 Message-Id: <20230103072807.19578-1-jaewon31.kim@samsung.com> X-Mailer: git-send-email 2.17.1 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrFKsWRmVeSWpSXmKPExsWy7bCmvq7yzc3JBmf/sVvMWb+GzWL1Jl+L 7s0zGS16379isri8aw6bxb01/1ktXn9bxmzxu/kyi8XfK+tZHDg9Dr95z+yxc9Zddo9NqzrZ PDZ9msTucWLGbxaP9/uusnn0bVnF6PF5k5zH6/2HGAM4o7JtMlITU1KLFFLzkvNTMvPSbZW8 g+Od403NDAx1DS0tzJUU8hJzU22VXHwCdN0yc4BuVFIoS8wpBQoFJBYXK+nb2RTll5akKmTk F5fYKqUWpOQUmBXoFSfmFpfmpevlpZZYGRoYGJkCFSZkZ9zefY6t4BRrxfmlJ9kbGPexdDFy ckgImEhMuDqTuYuRi0NIYAejxLKZM9kgnE+MEru2PITKfGaUON+yhBmmZc/TlVBVuxglXiw8 xwrh/GCU2HDvHyNIFZuAtsT7BZNYQWwRgVyJloVHmEBsZoFSibdvToBNEhbwkjjxsJEdxGYR UJWYsnYNG4jNK2Arcf3iTVaIbfISqzccgNp8i13iwCd2CNtF4vStv4wQtrDEq+NboOJSEp/f 7WWDsLMlnp48AtTLAWTnSDRskIUw7SXeX7IAMZkFNCXW79KHKFaU2Pl7LiPEkXwS7772sEJU 80p0tAlBlKhJtDz7CnWXjMTff8+gbA+JyeengANUSCBWYtqHiUwTGGVnISxYwMi4ilEstaA4 Nz212LDAEB5Fyfm5mxjBiU7LdAfjxLcf9A4xMnEwHmKU4GBWEuGd9GJTshBvSmJlVWpRfnxR aU5q8SFGU2BgTWSWEk3OB6bavJJ4QxNLAxMzIxMLY0tjMyVxXpuIdclCAumJJanZqakFqUUw fUwcnFINTFP8psduffDnZMtEs9vyebOnT65Jer1xk+wpzbhvj9K4Jkf47f9guPBF5waHCQs3 7soxOWbMFm+XKMDEk/mGudY7/PLkkKlexsuLDJzSXwd2Mn513jcj5oIFz/TC+TM2HPP6p912 iX3XZJ6G/Jq1iy9N21sgoq2wpqNK+/b7hZYHn6tWWMWa/J2SsOPrR5dn+aYfnD5k56sYX11d tEnQ/N+SuDb+2WViZ6J2vD2bn7z2mlZIU7LpvBVZ/zq3Kn4WXhJ6kCWr9pauHKfES5lWZZ95 rXlrK358/7+5pE0qQ/WyU03ugprMGsak1qa5SUxyV5/r5Dyetrp5zafbz9+ffiPDmTr/kKN2 ajqP48u2W0osxRmJhlrMRcWJAJxZSe79AwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprNLMWRmVeSWpSXmKPExsWy7bCSnK7Szc3JBh8+GVvMWb+GzWL1Jl+L 7s0zGS16379isri8aw6bxb01/1ktXn9bxmzxu/kyi8XfK+tZHDg9Dr95z+yxc9Zddo9NqzrZ PDZ9msTucWLGbxaP9/uusnn0bVnF6PF5k5zH6/2HGAM4o7hsUlJzMstSi/TtErgybu8+x1Zw irXi/NKT7A2M+1i6GDk5JARMJPY8XcnWxcjFISSwg1Fi4dkONoiEjMSb80+BijiAbGGJw4eL IWq+MUo0fTwEVsMmoC3xfsEkVhBbRKBY4vWHLmYQm1mgUuLf7VtgcWEBL4kTDxvZQWwWAVWJ KWvXgPXyCthKXL94kxVil7zE6g0HmCcw8ixgZFjFKJlaUJybnltsWGCUl1quV5yYW1yal66X nJ+7iREcflpaOxj3rPqgd4iRiYPxEKMEB7OSCO+kF5uShXhTEiurUovy44tKc1KLDzFKc7Ao ifNe6DoZLySQnliSmp2aWpBaBJNl4uCUamBynb/q/Q72Cbv1D73c+i6j5Pi0e8aH958RCItK tVnFxTnJKYDn8gV36VdShvpvG/oqHh4Xsa0tPJXz9LbW9TrWIz0y9juNJ61LlLmZwrdgZjtD hfuOrNJPQrqsW/Ysm9gleGGq75/VGTOckhL1O43dhLv7bpW++vbtPcvMDSY75M71ZRf8UFrc Jnu0I+m0e1moeaAjr+6N7RNFHY7OXan0e03X/VmfmMp8z7Gk7PB+Knhb/ERd2HfWr/fP8Gub BKxf88+7t5z5drbjZCH1t+y/vyjq3Um9LVKpufXl7BmVj7mUX4WJLuPsrzmexFis/m3SryMf ne6UMkT/yxeNdC1522sjtuXMl/6+3eKr/7kpsRRnJBpqMRcVJwIAzUxQ7q4CAAA= X-CMS-MailID: 20230103072834epcas1p3441ef50a6cc26ac48d184f1244b76a0e X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20230103072834epcas1p3441ef50a6cc26ac48d184f1244b76a0e References: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 The totalreserve_pages could be higher than the free because of watermark high or watermark boost. Handle this situation and fix it to 0 free size. Signed-off-by: Jaewon Kim --- mm/page_alloc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 218b28ee49ed..e510ae83d5f3 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5948,6 +5948,8 @@ long si_mem_available(void) * without causing swapping or OOM. */ available =3D global_zone_page_state(NR_FREE_PAGES) - totalreserve_pages; + if (available < 0) + available =3D 0; =20 /* * Not all the page cache can be freed, otherwise the system will --=20 2.17.1