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 C88A11B7F3 for ; Fri, 26 Jan 2024 13:01:43 +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=1706274103; cv=none; b=BiEQVP6OouKP0ScGHZRMK+u+fDetCWRQqOApi1l3Uyz84c+fmUn6umu9obtBLfpkuiJeQo6pTW0idh8qkImzAZcn43p+2TPd0UUZ8w3GhOx9hNMmNTH1qw2ZLtq3L05BaBNHgHJnDbGC/N7ENroz3bq5rZ1gVko71L1XoBUPSes= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706274103; c=relaxed/simple; bh=hiI0PLU+TNl5OwoQ17m7a9+DgU836ZBRWN8uCVHF9fY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=pXREfYnaP3PSblJKUC3P8NpoKnWoQQK7YhhFTFA06CfZCkNV09jpa0ovpsm8lQvNZUb30J+42leS9fscQirMp7XcIkGUBJUOBhTORLslPxwFRjqoe5u+pov4VBGXE7sxrQRjOkZeTP7TbwI2rhR0hZ06DEVKjqiRkJPzbOq+iIE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=E1CaTV8a; 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="E1CaTV8a" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AFDF5C433F1; Fri, 26 Jan 2024 13:01:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706274103; bh=hiI0PLU+TNl5OwoQ17m7a9+DgU836ZBRWN8uCVHF9fY=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=E1CaTV8a9jm1fBSNZX43DYBFZsmhpAepwmffYkm2VMYa0RlNOScuVKitqzEdhP48a Amp1OzPTmlZzI5zuAp9hxRN4Rs+L94oiZDzYuZGFpmEw3WYn26Tibwe6CHFnTpvJ1v km9gcPDJSRG/+BPBbf/DwViQza0WO2aeWs6dqExfEYHpoxrh3EwaJU9pj477dga6/T CcqpBcKYoDoE2TfUlvoEM9KfTSGsWh0kd3c8a8cdu0L1O7N4OKqpMBWTI9Kie+QufQ q7/5za6O05xphmR4+Ya1UlA+2gLltZj5kJqiu8syut+DAT/SwPCy8bXL7KWN3g1YD6 7g0MxsLm56/tw== Message-ID: <889ecfaa124883cd99e40d457562af45b5e97e7d.camel@kernel.org> Subject: Re: [PATCH v2 10/13] nfsd: move th_cnt into nfsd_net From: Jeff Layton To: Josef Bacik , Chuck Lever Cc: linux-nfs@vger.kernel.org, kernel-team@fb.com Date: Fri, 26 Jan 2024 08:01:41 -0500 In-Reply-To: <20240125215618.GB1602047@perftesting> References: <0fa7bf5b5bbc863180e50363435b5a56c43dc5e3.1706212208.git.josef@toxicpanda.com> <20240125215618.GB1602047@perftesting> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2024-01-25 at 16:56 -0500, Josef Bacik wrote: > On Thu, Jan 25, 2024 at 04:01:27PM -0500, Chuck Lever wrote: > > On Thu, Jan 25, 2024 at 02:53:20PM -0500, Josef Bacik wrote: > > > This is the last global stat, move it into nfsd_net and adjust all th= e > > > users to use that variant instead of the global one. > >=20 > > Hm. I thought nfsd threads were a global resource -- they service > > all network namespaces. So, shouldn't the same thread count be > > surfaced to all containers? Won't they all see all of the nfsd > > processes? > >=20 >=20 Each container is going to start /proc/fs/nfsd/threads number of threads regardless. I hadn't actually grokked that they just get tossed onto the pile of threads that service requests. Is is possible for one container to start a small number of threads but have its client load be such that it spills over and ends up stealing threads from other containers? > I don't think we want the network namespaces seeing how many threads exis= t in > the entire system right? >=20 > Additionally it appears that we can have multiple threads per network nam= espace, > so it's not like this will just show 1 for each individual nn, it'll show > however many threads have been configured for that nfsd in that network > namespace. >=20 > I'm good either way, but it makes sense to me to only surface the network > namespace related thread count. I could probably have a global counter a= nd only > surface the global counter if net =3D=3D &init_net. Let me know what you= prefer. > Thanks, >=20 The old stat meant "number of threads that are currently busy". The new one will mean "number of threads that are busy servicing requests in this namespace". The latter seems more useful on a per-ns basis. In fact, it might be interesting to throw out some kind of warning when the th_cnt exceeds the number of threads that you've allocated in the container. That might be an indicator that you didn't spin up enough and are poaching from other containers. Or... maybe we should be queueing the RPC when that happens so that you can't use more than you've allocated for the container? --=20 Jeff Layton