From patchwork Tue Sep 10 17:11:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felix Moessbauer X-Patchwork-Id: 13799032 Received: from mta-65-227.siemens.flowmailer.net (mta-65-227.siemens.flowmailer.net [185.136.65.227]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D35741A01CC for ; Tue, 10 Sep 2024 17:12:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.136.65.227 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725988338; cv=none; b=oLitthbMimOLhVX6guddHA+indr346awWyyQ5BRBrTpQX5CT6OU0M56RYAtQmw9IJnQtMaMJ0f9BDcvsxBXcOtYmL+utQ2ww08Ks9ivAuwerYaIGYj70U4sxez4341FP0G7WS4QYr1L3iRbZ+rTPzsXX7olX4mEzy15zP2YD6uQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725988338; c=relaxed/simple; bh=gEr1cCpObgM8xPbCaVvgWMgIX9dT3M9/NLL3bHUSkQ0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Ld980WP8amtIfNPMbCdg+sbxhr7hHw3WEooQLJu3E8s1XUca95k6TdhTvfF3wM+inD4Yrf8lq+zs2VaCfCBNJKsSM2xvuKP48ncHMRE77iJa4UswmRS0Vkv0QJoPBLJfcB9YOWilSSTb7AuqH9g2ZX2AR9sV7OjqH3YUzl4r7L8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=siemens.com; spf=pass smtp.mailfrom=rts-flowmailer.siemens.com; dkim=pass (2048-bit key) header.d=siemens.com header.i=felix.moessbauer@siemens.com header.b=RlV2B1TK; arc=none smtp.client-ip=185.136.65.227 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=siemens.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rts-flowmailer.siemens.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=siemens.com header.i=felix.moessbauer@siemens.com header.b="RlV2B1TK" Received: by mta-65-227.siemens.flowmailer.net with ESMTPSA id 2024091017121132c193da9a817a2218 for ; Tue, 10 Sep 2024 19:12:11 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=fm1; d=siemens.com; i=felix.moessbauer@siemens.com; h=Date:From:Subject:To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Cc:References:In-Reply-To; bh=V02Mv7Qi+O8u5o24OCWYd+wHeSgI3uHzoIbW8MTflmc=; b=RlV2B1TKiWSOzruY84ut2sHjQ2bqCLkRq4Sv25fhLx1qObm7+r7g0Wrki+RKDlyqnthIPo lDYaoF5GbqUISyZdt2eSuth76T4BGSJ7mikn5QKmiXynWF4jQcBJcs3IoVWZyKhycQPlWubn HxLf7+nIh9PECo/n9F+807gV2z0pFWV/j/nBxGps3jLexhxsydqcpwGNOsgLVXVPfms8Zbef 6nz1dUaTmgkd2gkMK18tzILuPYsHefNt8IWTRrgR9Xy1kfQ3/5Z1B9sZsBf3l6zVv9i1DVPu muSYahkfovKhmKo0OiGiedo+DGG2JkqQXZ5h49A/xf2Ynm5fqC5e7ZlA==; From: Felix Moessbauer To: axboe@kernel.dk Cc: asml.silence@gmail.com, linux-kernel@vger.kernel.org, io-uring@vger.kernel.org, cgroups@vger.kernel.org, dqminh@cloudflare.com, longman@redhat.com, adriaan.schmidt@siemens.com, florian.bezdeka@siemens.com, Felix Moessbauer Subject: [PATCH v3 1/2] io_uring/io-wq: do not allow pinning outside of cpuset Date: Tue, 10 Sep 2024 19:11:56 +0200 Message-Id: <20240910171157.166423-2-felix.moessbauer@siemens.com> In-Reply-To: <20240910171157.166423-1-felix.moessbauer@siemens.com> References: <20240910171157.166423-1-felix.moessbauer@siemens.com> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Flowmailer-Platform: Siemens Feedback-ID: 519:519-1321639:519-21489:flowmailer The io worker threads are userland threads that just never exit to the userland. By that, they are also assigned to a cgroup (the group of the creating task). When changing the affinity of the io_wq thread via syscall, we must only allow cpumasks within the limits defined by the cpuset controller of the cgroup (if enabled). Fixes: da64d6db3bd3 ("io_uring: One wqe per wq") Signed-off-by: Felix Moessbauer --- io_uring/io-wq.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/io_uring/io-wq.c b/io_uring/io-wq.c index f1e7c670add8..c7055a8895d7 100644 --- a/io_uring/io-wq.c +++ b/io_uring/io-wq.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -1322,17 +1323,29 @@ static int io_wq_cpu_offline(unsigned int cpu, struct hlist_node *node) int io_wq_cpu_affinity(struct io_uring_task *tctx, cpumask_var_t mask) { + cpumask_var_t allowed_mask; + int ret = 0; + if (!tctx || !tctx->io_wq) return -EINVAL; + if (!alloc_cpumask_var(&allowed_mask, GFP_KERNEL)) + return -ENOMEM; + rcu_read_lock(); - if (mask) - cpumask_copy(tctx->io_wq->cpu_mask, mask); - else - cpumask_copy(tctx->io_wq->cpu_mask, cpu_possible_mask); + cpuset_cpus_allowed(tctx->io_wq->task, allowed_mask); + if (mask) { + if (cpumask_subset(mask, allowed_mask)) + cpumask_copy(tctx->io_wq->cpu_mask, mask); + else + ret = -EINVAL; + } else { + cpumask_copy(tctx->io_wq->cpu_mask, allowed_mask); + } rcu_read_unlock(); - return 0; + free_cpumask_var(allowed_mask); + return ret; } /*