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Tue, 26 Apr 2022 10:44:12 -0700 Received: from twshared10896.25.frc3.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::e) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Tue, 26 Apr 2022 10:44:10 -0700 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id CA7D7E2D486F; Tue, 26 Apr 2022 10:43:40 -0700 (PDT) From: Stefan Roesch To: , , , , CC: , Subject: [RFC PATCH v1 14/18] sched: add new fields to task_struct Date: Tue, 26 Apr 2022 10:43:31 -0700 Message-ID: <20220426174335.4004987-15-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220426174335.4004987-1-shr@fb.com> References: <20220426174335.4004987-1-shr@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-GUID: BDVXMzaBZaXm9P2A5F2XW4Qag5L0nNgu X-Proofpoint-ORIG-GUID: BDVXMzaBZaXm9P2A5F2XW4Qag5L0nNgu X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-04-26_05,2022-04-26_02,2022-02-23_01 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 0221C12004A X-Stat-Signature: 36bhhj1n94974aoutcwg5r4atjofn1d5 Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=fb.com header.s=facebook header.b=EWyYuhY2; dmarc=pass (policy=reject) header.from=fb.com; spf=none (imf29.hostedemail.com: domain of "prvs=5115329de3=shr@fb.com" has no SPF policy when checking 67.231.145.42) smtp.mailfrom="prvs=5115329de3=shr@fb.com" X-Rspam-User: X-HE-Tag: 1650995050-922697 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add two new fields to the task_struct to support async write throttling. - One field to store how long writes are throttled: bdp_pause - The other field to store the number of dirtied pages: bdp_nr_dirtied_pause Signed-off-by: Stefan Roesch --- include/linux/sched.h | 3 +++ kernel/fork.c | 1 + 2 files changed, 4 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index a8911b1f35aa..98d70f2945e3 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1327,6 +1327,9 @@ struct task_struct { /* Start of a write-and-pause period: */ unsigned long dirty_paused_when; =20 + unsigned long bdp_pause; + int bdp_nr_dirtied_pause; + #ifdef CONFIG_LATENCYTOP int latency_record_count; struct latency_record latency_record[LT_SAVECOUNT]; diff --git a/kernel/fork.c b/kernel/fork.c index 9796897560ab..5bc6298827fc 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2316,6 +2316,7 @@ static __latent_entropy struct task_struct *copy_pr= ocess( p->nr_dirtied =3D 0; p->nr_dirtied_pause =3D 128 >> (PAGE_SHIFT - 10); p->dirty_paused_when =3D 0; + p->bdp_nr_dirtied_pause =3D -1; =20 p->pdeath_signal =3D 0; INIT_LIST_HEAD(&p->thread_group); --=20 2.30.2