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Thu, 16 Jun 2022 14:40:17 -0700 Received: from twshared18317.08.ash9.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::c) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Thu, 16 Jun 2022 14:40:15 -0700 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id DD35C108B70B8; Thu, 16 Jun 2022 14:22:23 -0700 (PDT) From: Stefan Roesch To: , , , , CC: , , , , , Subject: [PATCH v9 12/14] io_uring: Add tracepoint for short writes Date: Thu, 16 Jun 2022 14:22:19 -0700 Message-ID: <20220616212221.2024518-13-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220616212221.2024518-1-shr@fb.com> References: <20220616212221.2024518-1-shr@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-ORIG-GUID: 8vq3YT20DAO4gpEuMJm-IvPsbvqZjjHj X-Proofpoint-GUID: 8vq3YT20DAO4gpEuMJm-IvPsbvqZjjHj X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.64.514 definitions=2022-06-16_18,2022-06-16_01,2022-02-23_01 ARC-Seal: i=1; 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dkim=pass header.d=fb.com header.s=facebook header.b=pXUvPIe1; spf=none (imf19.hostedemail.com: domain of "prvs=7166657324=shr@fb.com" has no SPF policy when checking 67.231.145.42) smtp.mailfrom="prvs=7166657324=shr@fb.com"; dmarc=pass (policy=reject) header.from=fb.com X-Rspam-User: X-HE-Tag: 1655415619-30497 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: This adds the io_uring_short_write tracepoint to io_uring. A short write is issued if not all pages that are required for a write are in the page cache and the async buffered writes have to return EAGAIN. Signed-off-by: Stefan Roesch --- fs/io_uring.c | 3 +++ include/trace/events/io_uring.h | 25 +++++++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/fs/io_uring.c b/fs/io_uring.c index 22a0bb8c5fe5..510c09192832 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -4597,6 +4597,9 @@ static int io_write(struct io_kiocb *req, unsigned = int issue_flags) if (ret2 !=3D req->cqe.res && ret2 >=3D 0 && need_complete_io(req)) { struct io_async_rw *rw; =20 + trace_io_uring_short_write(req->ctx, kiocb->ki_pos - ret2, + req->cqe.res, ret2); + /* This is a partial write. The file pos has already been * updated, setup the async struct to complete the request * in the worker. Also update bytes_done to account for diff --git a/include/trace/events/io_uring.h b/include/trace/events/io_ur= ing.h index 66fcc5a1a5b1..25df513660cc 100644 --- a/include/trace/events/io_uring.h +++ b/include/trace/events/io_uring.h @@ -600,6 +600,31 @@ TRACE_EVENT(io_uring_cqe_overflow, __entry->cflags, __entry->ocqe) ); =20 +TRACE_EVENT(io_uring_short_write, + + TP_PROTO(void *ctx, u64 fpos, u64 wanted, u64 got), + + TP_ARGS(ctx, fpos, wanted, got), + + TP_STRUCT__entry( + __field(void *, ctx) + __field(u64, fpos) + __field(u64, wanted) + __field(u64, got) + ), + + TP_fast_assign( + __entry->ctx =3D ctx; + __entry->fpos =3D fpos; + __entry->wanted =3D wanted; + __entry->got =3D got; + ), + + TP_printk("ring %p, fpos %lld, wanted %lld, got %lld", + __entry->ctx, __entry->fpos, + __entry->wanted, __entry->got) +); + #endif /* _TRACE_IO_URING_H */ =20 /* This part must be outside protection */ --=20 2.30.2