From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 938EC227E94; Mon, 2 Jun 2025 14:25:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748874330; cv=none; b=ScOpkkts9DgifL5hIQulFPHrXrZDR4kgwMwqDlqXoE7EIMbBZwvoSW7OaT7+ulZg0DcFK/Dp1pFRSyjrzYjyzJYvRO4f5+WjDXNF2ItIY7ZTspGjCT0UTO3q0RFUrmY8J+Ln2rpeRZS1VKaATewNvD2wQPw13zhLRstkKNjTudY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748874330; c=relaxed/simple; bh=eDG/1NSreFu71Q3xl63iQ3YkauXaAXlgS6w8hX2NnL4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=b2QAhTr36676st1LaauyNVz8lcwVRlEmw+saMtUJ/LhttQ/GQb4WdqF+PDeeJwTBn5wvqXb2DpdNypoUGBuSUxq6dQTZ/o4AYUHoo0fvRKmzYNz2xSKdu5k/KxJsxMOMQwjF5E3vwZVBsIMhPpK7jqXs0X6qUA2O2dvtMbIIrQ0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=1+HALFmO; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="1+HALFmO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 20413C4CEEB; Mon, 2 Jun 2025 14:25:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1748874330; bh=eDG/1NSreFu71Q3xl63iQ3YkauXaAXlgS6w8hX2NnL4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1+HALFmO1MHsUK+g6WSiO1dkKmiMP71iZhqginiTnkHx9kFNbgXlEa0wWexL6jQzE 8Ad1oxoS6lklwKZ888JVz38Z4dZdnIGrwN6zE1kW9MLFVEOlDplxI2Tuz27nnp5oe3 uH+mH4iveh3eS+Jo9ho1jFUHS6mKkizUdEuH+gXw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kuniyuki Iwashima , Paolo Abeni , Jakub Kicinski , Lee Jones Subject: [PATCH 6.6 404/444] af_unix: Bulk update unix_tot_inflight/unix_inflight when queuing skb. Date: Mon, 2 Jun 2025 15:47:48 +0200 Message-ID: <20250602134357.318497881@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250602134340.906731340@linuxfoundation.org> References: <20250602134340.906731340@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kuniyuki Iwashima commit 22c3c0c52d32f41cc38cd936ea0c93f22ced3315 upstream. Currently, we track the number of inflight sockets in two variables. unix_tot_inflight is the total number of inflight AF_UNIX sockets on the host, and user->unix_inflight is the number of inflight fds per user. We update them one by one in unix_inflight(), which can be done once in batch. Also, sendmsg() could fail even after unix_inflight(), then we need to acquire unix_gc_lock only to decrement the counters. Let's bulk update the counters in unix_add_edges() and unix_del_edges(), which is called only for successfully passed fds. Signed-off-by: Kuniyuki Iwashima Acked-by: Paolo Abeni Link: https://lore.kernel.org/r/20240325202425.60930-5-kuniyu@amazon.com Signed-off-by: Jakub Kicinski Signed-off-by: Lee Jones Signed-off-by: Greg Kroah-Hartman --- net/unix/garbage.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) --- a/net/unix/garbage.c +++ b/net/unix/garbage.c @@ -144,6 +144,7 @@ static void unix_free_vertices(struct sc } DEFINE_SPINLOCK(unix_gc_lock); +unsigned int unix_tot_inflight; void unix_add_edges(struct scm_fp_list *fpl, struct unix_sock *receiver) { @@ -168,7 +169,10 @@ void unix_add_edges(struct scm_fp_list * unix_add_edge(fpl, edge); } while (i < fpl->count_unix); + WRITE_ONCE(unix_tot_inflight, unix_tot_inflight + fpl->count_unix); out: + WRITE_ONCE(fpl->user->unix_inflight, fpl->user->unix_inflight + fpl->count); + spin_unlock(&unix_gc_lock); fpl->inflight = true; @@ -191,7 +195,10 @@ void unix_del_edges(struct scm_fp_list * unix_del_edge(fpl, edge); } while (i < fpl->count_unix); + WRITE_ONCE(unix_tot_inflight, unix_tot_inflight - fpl->count_unix); out: + WRITE_ONCE(fpl->user->unix_inflight, fpl->user->unix_inflight - fpl->count); + spin_unlock(&unix_gc_lock); fpl->inflight = false; @@ -234,7 +241,6 @@ void unix_destroy_fpl(struct scm_fp_list unix_free_vertices(fpl); } -unsigned int unix_tot_inflight; static LIST_HEAD(gc_candidates); static LIST_HEAD(gc_inflight_list); @@ -255,13 +261,8 @@ void unix_inflight(struct user_struct *u WARN_ON_ONCE(list_empty(&u->link)); } u->inflight++; - - /* Paired with READ_ONCE() in wait_for_unix_gc() */ - WRITE_ONCE(unix_tot_inflight, unix_tot_inflight + 1); } - WRITE_ONCE(user->unix_inflight, user->unix_inflight + 1); - spin_unlock(&unix_gc_lock); } @@ -278,13 +279,8 @@ void unix_notinflight(struct user_struct u->inflight--; if (!u->inflight) list_del_init(&u->link); - - /* Paired with READ_ONCE() in wait_for_unix_gc() */ - WRITE_ONCE(unix_tot_inflight, unix_tot_inflight - 1); } - WRITE_ONCE(user->unix_inflight, user->unix_inflight - 1); - spin_unlock(&unix_gc_lock); }