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 5AA351B0416; Thu, 12 Jun 2025 15:58:02 +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=1749743882; cv=none; b=BSGyDH5KvJmltzyhi/InBRh2OgApF1QzLGSl0AEn4XqEikCV+q8j5kpG6NWTHnsdzJIKrQPi/iZUEYN6x2IpJ4zP84O/IlaPH8cTewqA5ZxoL32zR2lGP2e9WGJvxa+lA1RgFc6wzGLPq6TjWOoyO6YpIq5QUsJ8pdcl589WwPk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749743882; c=relaxed/simple; bh=9ugcUth9fcr6VmoX3sXCSjf089RNRfOkwFtoMvhQvHE=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=YDjBANdAotFkmq7aR44HMi6n0rjLVzwCNoaLqpPvteTSflmEhOiYZpsWXLOXuKikYbzawoBEfnqpoPGNpAe6eoiap65gD9tz70fHGk9QdmkX/QfOY1dGP67COJ7rxVp9ka1o2Zf2miejb4P6gzMk97DG0IVXcW0yI27xaON1sLk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EcuHt7LD; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="EcuHt7LD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9FAF1C4CEEE; Thu, 12 Jun 2025 15:58:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1749743882; bh=9ugcUth9fcr6VmoX3sXCSjf089RNRfOkwFtoMvhQvHE=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=EcuHt7LD13Mns1fBjNILUZyNHYn5swQVPycMlahnrEkFTg1nPvqvALRtEr6VkOmGj 8b4BMLisA4mAKwhK6OCs3OVboDo6qvsDDo7jtquuWBvUtV/AA7tDuyATHJEkExoSDk HDJLLKjrnjL+6BJLTgXaV/aZp/c8HgVW08bDzNE55wpkG4qmiUEDSrkt0v8Jg7kVDX Fj592zrwNZ1TcsTPZmI4zoirzLuwWzhkophuqMUopJjnxguJD5PiOG/NMNVoVC0Yf3 ytY/eSiJdnN/KeGhtKG3+Y5/nRlpQtB/NLpQIoXodzuFU7YMNNlPaFgcdDcdZXTb4e UwkL1ihfTw5Fg== Message-ID: Subject: Re: [PATCH 1/2] nfsd: use threads array as-is in netlink interface From: Jeff Layton To: Chuck Lever , Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Trond Myklebust , Anna Schumaker , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: Mike Snitzer , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, netdev@vger.kernel.org Date: Thu, 12 Jun 2025 11:57:59 -0400 In-Reply-To: <20250527-rpc-numa-v1-1-fa1d98e9a900@kernel.org> References: <20250527-rpc-numa-v1-0-fa1d98e9a900@kernel.org> <20250527-rpc-numa-v1-1-fa1d98e9a900@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn 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every NUMA node. >=20 > The netlink control interface however constructs an array of length > nfsd_nrpools() and fills any unprovided slots with 0's. This behavior > defeats the special casing that the old interface relies on. >=20 > Change nfsd_nl_threads_set_doit() to pass down the array from userland > as-is. >=20 > Fixes: 7f5c330b2620 ("nfsd: allow passing in array of thread counts via n= etlink") > Reported-by: Mike Snitzer > Closes: https://lore.kernel.org/linux-nfs/aDC-ftnzhJAlwqwh@kernel.org/ > Signed-off-by: Jeff Layton > --- > fs/nfsd/nfsctl.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) >=20 > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c > index ac265d6fde35df4e02b955050f5b0ef22e6e519c..22101e08c3e80350668e94c39= 5058bc228b08e64 100644 > --- a/fs/nfsd/nfsctl.c > +++ b/fs/nfsd/nfsctl.c > @@ -1611,7 +1611,7 @@ int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *s= kb, > */ > int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info= ) > { > - int *nthreads, count =3D 0, nrpools, i, ret =3D -EOPNOTSUPP, rem; > + int *nthreads, nrpools =3D 0, i, ret =3D -EOPNOTSUPP, rem; > struct net *net =3D genl_info_net(info); > struct nfsd_net *nn =3D net_generic(net, nfsd_net_id); > const struct nlattr *attr; > @@ -1623,12 +1623,11 @@ int nfsd_nl_threads_set_doit(struct sk_buff *skb,= struct genl_info *info) > /* count number of SERVER_THREADS values */ > nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) { > if (nla_type(attr) =3D=3D NFSD_A_SERVER_THREADS) > - count++; > + nrpools++; > } > =20 > mutex_lock(&nfsd_mutex); > =20 > - nrpools =3D max(count, nfsd_nrpools(net)); > nthreads =3D kcalloc(nrpools, sizeof(int), GFP_KERNEL); > if (!nthreads) { > ret =3D -ENOMEM; I noticed that this didn't go in to the recent merge window. This patch fixes a rather nasty regression when you try to start the server on a NUMA-capable box. It all looks like it works, but some RPCs get silently dropped on the floor (if they happen to be received into a node with no threads). It took me a while to track down the problem after Mike reported it. Can we go ahead and pull this in and send it to stable? Also, did this patch fix the problem for you, Mike? Thanks, --=20 Jeff Layton