From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B1C6EC433EF for ; Thu, 13 Jan 2022 23:40:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238326AbiAMXkT (ORCPT ); Thu, 13 Jan 2022 18:40:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238291AbiAMXkP (ORCPT ); Thu, 13 Jan 2022 18:40:15 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37B8BC06173F for ; Thu, 13 Jan 2022 15:40:15 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id n2-20020a255902000000b0060f9d75eafeso14819428ybb.1 for ; Thu, 13 Jan 2022 15:40:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=M6CqLRKobTxmQJYwGP116eObFPKtwslTaqzW/rSJTK8=; b=qMGBjdhvTEK6hecBGOuRoK6F9ospIcTv+bSkzHtDzzW7elpIvv8C06+6MKkfz7rono PuJSCFA3CXEtek3Rf9jxxOyl/l7tTBEZ04+rY1/G7T+btp87CZdeFeT3eLx7mSuseTHi iUvCt0mbOOYItyWq9/z/yf7UhMvCB6omSP+9cILENtov+4CzMlPKk4ChS/CCDgOGcR7x rYu6FH+COfsfs2ihA+0r4LYfiiAGOXB0NDa+BWnm9ZmHakjHKtseaH4QESWTp8WFfWnH 58XhmuiKFvO8OPBHefgWNMoqmUWy+6FE+BPuXyneucVFuZG5qCO1pP3RrHlwIjnG+ltC yX+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=M6CqLRKobTxmQJYwGP116eObFPKtwslTaqzW/rSJTK8=; b=uQb1a+e4gCzSgQf1I/MTHwEmuB/F615LVf7xyUA+49ZNX+UmP496cfvq9j+p79HFCT FKyBH5G3ayZecwChcOuestiMvcMRUlpztcLZNqSFwZYHEYInUSp4Ha2PImVq1RKRYhnq iiuN02NsUo9zNol5Adci0EAoOP9g0F7d/lABO75q2HB5qwENid/l9vnxGRO5Eufvy5ao ddrmCFAFuXe81bHqsKUigK9jnkd4PUaFUghA0W+Sy1YQzNINjzvJX3ptKfKrtjTvk8Tj N4+h317qZfFPrzV83G7MEjB2qteN4zP4lczBzbpRgjFLNmHRA0AH7cXf14j1s5OkteVQ kg3w== X-Gm-Message-State: AOAM533buuHWsFubzvgU1kp1+jzRg6RHmtIHH1wDII+2B26mUiYWxYQE mg8oDK+rm+p942/S+AYB67YObpFI X-Google-Smtp-Source: ABdhPJyMyvqiBBmhkwL82olAcxjEEcUWe5ozz1YnPt/AtCMregTQoiHsk98ChHrmtDs/+uO8eeFVk5cL X-Received: from posk.svl.corp.google.com ([2620:15c:2cd:202:c548:e79f:8954:121f]) (user=posk job=sendgmr) by 2002:a25:ae8b:: with SMTP id b11mr9266950ybj.453.1642117214365; Thu, 13 Jan 2022 15:40:14 -0800 (PST) Date: Thu, 13 Jan 2022 15:39:40 -0800 In-Reply-To: <20220113233940.3608440-1-posk@google.com> Message-Id: <20220113233940.3608440-6-posk@google.com> Mime-Version: 1.0 References: <20220113233940.3608440-1-posk@google.com> X-Mailer: git-send-email 2.34.1.703.g22d0c6ccf7-goog Subject: [RFC PATCH v2 5/5] sched: UMCG: allow to sys_umcg_kick UMCG servers From: Peter Oskolkov To: Peter Zijlstra , mingo@redhat.com, tglx@linutronix.de, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, x86@kernel.org, pjt@google.com, posk@google.com, avagin@google.com, jannh@google.com, tdelisle@uwaterloo.ca, posk@posk.io Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add enum umcg_kick_flags: @UMCG_KICK_RESCHED: reschedule the task; used for worker preemption @UMCG_KICK_TTWU: wake the task; used to wake servers. It is sometimes useful to wake UMCG servers from the userspace, for example when a server detects a worker wakeup and wakes an idle server to run the newly woken worker. Signed-off-by: Peter Oskolkov --- include/uapi/linux/umcg.h | 10 ++++++++++ kernel/sched/umcg.c | 7 +++++-- 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/umcg.h b/include/uapi/linux/umcg.h index 93fccb44283b..a29e5e91a251 100644 --- a/include/uapi/linux/umcg.h +++ b/include/uapi/linux/umcg.h @@ -148,4 +148,14 @@ enum umcg_ctl_flag { UMCG_CTL_WORKER = 0x10000, }; +/** + * enum umcg_kick_flag - flags to pass to sys_umcg_kick + * @UMCG_KICK_RESCHED: reschedule the task; used for worker preemption + * @UMCG_KICK_TTWU: wake the task; used to wake servers + */ +enum umcg_kick_flag { + UMCG_KICK_RESCHED = 0x001, + UMCG_KICK_TTWU = 0x002, +}; + #endif /* _UAPI_LINUX_UMCG_H */ diff --git a/kernel/sched/umcg.c b/kernel/sched/umcg.c index b85dec6b82e4..e33ec9eddc3e 100644 --- a/kernel/sched/umcg.c +++ b/kernel/sched/umcg.c @@ -669,12 +669,15 @@ SYSCALL_DEFINE2(umcg_kick, u32, flags, pid_t, tid) if (!task) return -ESRCH; - if (flags) + if (flags != UMCG_KICK_RESCHED && flags != UMCG_KICK_TTWU) return -EINVAL; #ifdef CONFIG_SMP - smp_send_reschedule(task_cpu(task)); + if (flags == UMCG_KICK_RESCHED) + smp_send_reschedule(task_cpu(task)); #endif + if (flags == UMCG_KICK_TTWU) + try_to_wake_up(task, TASK_NORMAL, 0); return 0; } -- 2.34.1.703.g22d0c6ccf7-goog