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AJvYcCWidQoukho+j5xF4vL8I4kpcG9Zl/V1CeRxnkGbg9Sk7VYVF9Ltwyvm8fuAq9SzBQg1+d0PchfePxRlk+BR@vger.kernel.org X-Gm-Message-State: AOJu0YwDlHPGBs89U01xG5lblipGAQHCTjCCp7rRnwMAdrv547cJXYMU qlJmbnwsTIx0za4Js/z2ntH7H0WbkuCe7a7rY4r6meMlbQnu/5a67vODiB1SFqs= X-Google-Smtp-Source: AGHT+IGj67LQzHccSPaoNRSSYU6or2x5eE08VEYq8Ivkb29KJsMnCnNhiTd26q1ONYBfh6ziDHgzow== X-Received: by 2002:a17:902:e808:b0:20c:8f98:5dbe with SMTP id d9443c01a7336-210c6ae3d6bmr369676635ad.33.1730611497060; Sat, 02 Nov 2024 22:24:57 -0700 (PDT) Received: from localhost.localdomain ([2620:11a:c019:0:65e:3115:2f58:c5fd]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e93dac02acsm5896036a91.27.2024.11.02.22.24.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 Nov 2024 22:24:56 -0700 (PDT) From: Joe Damato To: netdev@vger.kernel.org Cc: hdanton@sina.com, bagasdotme@gmail.com, pabeni@redhat.com, namangulati@google.com, edumazet@google.com, amritha.nambiar@intel.com, sridhar.samudrala@intel.com, sdf@fomichev.me, peter@typeblog.net, m2shafiei@uwaterloo.ca, bjorn@rivosinc.com, hch@infradead.org, willy@infradead.org, willemdebruijn.kernel@gmail.com, skhawaja@google.com, kuba@kernel.org, Martin Karsten , Joe Damato , Alexander Viro , Christian Brauner , Jan Kara , linux-fsdevel@vger.kernel.org (open list:FILESYSTEMS (VFS and infrastructure)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH net-next v5 4/7] eventpoll: Trigger napi_busy_loop, if prefer_busy_poll is set Date: Sun, 3 Nov 2024 05:24:06 +0000 Message-Id: <20241103052421.518856-5-jdamato@fastly.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241103052421.518856-1-jdamato@fastly.com> References: <20241103052421.518856-1-jdamato@fastly.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Martin Karsten Setting prefer_busy_poll now leads to an effectively nonblocking iteration though napi_busy_loop, even when busy_poll_usecs is 0. Signed-off-by: Martin Karsten Co-developed-by: Joe Damato Signed-off-by: Joe Damato Tested-by: Joe Damato Tested-by: Martin Karsten Acked-by: Stanislav Fomichev Reviewed-by: Sridhar Samudrala --- v1 -> v2: - Rebased to apply now that commit b9ca079dd6b0 ("eventpoll: Annotate data-race of busy_poll_usecs") has been picked up from VFS. fs/eventpoll.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 1ae4542f0bd8..f9e0d9307dad 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -420,7 +420,9 @@ static bool busy_loop_ep_timeout(unsigned long start_time, static bool ep_busy_loop_on(struct eventpoll *ep) { - return !!READ_ONCE(ep->busy_poll_usecs) || net_busy_loop_on(); + return !!READ_ONCE(ep->busy_poll_usecs) || + READ_ONCE(ep->prefer_busy_poll) || + net_busy_loop_on(); } static bool ep_busy_loop_end(void *p, unsigned long start_time)