From patchwork Wed Feb 14 08:48:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Dumazet X-Patchwork-Id: 13556072 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BE7086FA8 for ; Wed, 14 Feb 2024 08:48:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707900514; cv=none; b=hkIocTMUG7g1FDGyq/m0ckE87VhzX0D8EuBsEpShvdyFAe2qdZdnEvi+K1TK8hdn3NEe01z3X8+iU5hQUA1oBR8w5TUNvjxRPz0x8dC8ggyJJtH6382y1F9+TF6PFpuH5aP/GADbKT+9ApAKa0wrlL4JMRLgzAA0+Yi5NkvPtlc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707900514; c=relaxed/simple; bh=tb/rHH7nD+tvYMzZ/pXuxRJUhft+UD56HAU8GYSKNVA=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=Me1FLIpZCSfkwGIVkRBqv4Qnms5a4cH4wpB4GcU97xFDkjAg8zid2ZVGGrr4ywwG5aof1cB7btN+wAcqW7C5HQ/tehaWS+9uCZhPznnHiDTKfEmKqqrFfZ4PSf67GP0SRj0Z6CISMGX7JBCazpMCeoL0gMxUdU1L0JjLlvxnO98= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--edumazet.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=tFEFahoq; arc=none smtp.client-ip=209.85.219.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--edumazet.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="tFEFahoq" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-dcc58cddb50so3249062276.0 for ; Wed, 14 Feb 2024 00:48:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1707900512; x=1708505312; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=VnZBAXHHBHi7NJ95r/XBvn9wLkNSo/WMgRYmbP1bpJM=; b=tFEFahoqv9sXFSjlZ/8B2OECr83kr9wjocte71kUY4h7pe7u/cYeRCa2kvFHCuOse2 CZCxU8PXKkVJGwY+30i1C36UUQKiB32D5H5LKJADd5NgFGkq8KEqgiRBE8hyMx+55uj3 ldWppqcVrlMm1x2x7Ukhz9ykAY6ik+PT3mY1oj73qv4v2wBkjdqNeyXRsmM6laZ1zLnX 2j2biGtQLOjuPlNn/2MYscIh+8K+0xQrE9GH+4d9JCsKjpK7XeBW2V9kBouOaRzwGA2Y cQTZF4PaAL539gZQGGudFguYHzPk6CFk4qlDbYK9gpYJ2CO+E5MEqQcKmLrqGwXdxQwq qLzA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707900512; x=1708505312; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=VnZBAXHHBHi7NJ95r/XBvn9wLkNSo/WMgRYmbP1bpJM=; b=ZDjn62ZXbrdZ40AO0VSRE8OSCG97Gn3sh1HOTTROKBO+sls5SDaYNaSez+5GuXnudr mjuXOHfhwPBtwUnzAW4poTaUmehTvT5Y1Tzg5CLC/SFyPlT7SeSmyH071Ej3zm91L1SW qk0apAlf67wG0thcVPST83gRJBfoi4RQLAd4eSpPBSit8je3e24uV7pGp/oCYpK061ET N9ZPe07RcQ5mc79kldzxbfBnbXqCvTp/aLolXpIEkqXfnCYGt+kcESCbkHv/zdQQXsHj P6EBHb8p0Hl5hr0/CWuHCSOPsz6osuRp4vL8PfVHTceDT41qltrG7sxsQgvgpeb6F9DY ecRw== X-Forwarded-Encrypted: i=1; AJvYcCWDN+EbtdYnMyyDHtJQNjPB4hLmciKShXOyFXuWNxJsDSX+byvtbStDvNTtm4uKGmxj53giRoew55C75FTju7fvtufqRswY X-Gm-Message-State: AOJu0Yw0ZhvDtuDwcq2mEfVwHmVocCNJAvmHXYEXMrXdxM/oQIbZ6zDz gCHTA/UhIgU4ftfmw5rLE/9VXPDGiS+J86t+hFIFuQX6r5EbC9tjWa7TkvMNC9eH8sDOfVI/PIQ O4J3r4w1UDg== X-Google-Smtp-Source: AGHT+IGqH2Ji1XS8yKB5q7FUw5pXkurHoQqkeSFcC81rXekWCkW6y6p+vwSpG0k9rx+z7LT+GsWhIVuGtnq/nw== X-Received: from edumazet1.c.googlers.com ([fda3:e722:ac3:cc00:2b:7d90:c0a8:395a]) (user=edumazet job=sendgmr) by 2002:a05:6902:1007:b0:dc9:5ef8:2b2d with SMTP id w7-20020a056902100700b00dc95ef82b2dmr453013ybt.4.1707900511818; Wed, 14 Feb 2024 00:48:31 -0800 (PST) Date: Wed, 14 Feb 2024 08:48:27 +0000 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.43.0.687.g38aa6559b0-goog Message-ID: <20240214084829.684541-1-edumazet@google.com> Subject: [PATCH 0/2] kobject: reduce uevent_sock_mutex contention From: Eric Dumazet To: Greg Kroah-Hartman , Christian Brauner Cc: linux-kernel , "Rafael J . Wysocki" , Andrew Morton , netdev@vger.kernel.org, "David S . Miller" , Jakub Kicinski , Paolo Abeni , Eric Dumazet , Eric Dumazet This series reduces the (small ?) contention over uevent_sock_mutex, noticed when creating/deleting many network namespaces/devices. 1) uevent_seqnum becomes an atomic64_t 2) Only acquire uevent_sock_mutex whenever using uevent_sock_list Eric Dumazet (2): kobject: make uevent_seqnum atomic kobject: reduce uevent_sock_mutex scope include/linux/kobject.h | 2 +- kernel/ksysfs.c | 2 +- lib/kobject_uevent.c | 24 +++++++++++------------- 3 files changed, 13 insertions(+), 15 deletions(-)