From: "Luck, Tony" <tony.luck@intel.com>
To: Mark Brown <broonie@kernel.org>, Takashi Iwai <tiwai@suse.de>
Cc: David Lang <david@lang.hm>,
"ksummit-2013-discuss@lists.linux-foundation.org"
<ksummit-2013-discuss@lists.linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
"torvalds@linux-foundation.org" <torvalds@linux-foundation.org>,
Willy Tarreau <w@1wt.eu>
Subject: RE: [Ksummit-2013-discuss] When to push bug fixes to mainline
Date: Tue, 16 Jul 2013 17:58:58 +0000 [thread overview]
Message-ID: <3908561D78D1C84285E8C5FCA982C28F31C845B1@ORSMSX106.amr.corp.intel.com> (raw)
In-Reply-To: <20130716165933.GU22506@sirena.org.uk>
>> Maybe some QA period before the release might help, but who would
>> care? (Especially under the situation where everybody has own x.y
>> stable tree?)
>
> Hopefully people tracking the upstream stable trees would be throwing
> any pre-release stuff into their QA processes before it was officially
> released upstream, though I'd not count on it.
Linux testing is (realistically) done by inflicting changes on gradually wider
sets of end users.
We go through these stages (possibly a couple of extra steps where maintainer trees
are nested)
1) Author of a patch tests on their own machine (and perhaps a few others)
2) Patch is posted. A few more people grab and test.
3) Patch is applied to a maintainer tree, which is slurped into linux-next.
A few hundred brave folks now have this patch in their binary, but most extra testing
is purely accidental. These users aren't running focused tests on the area touched
by the patch.
4) Patch is pulled by Linus. Pretty large jump in the number of users running the code
so we start to get good breadth of testing on different machines with different sets
of CONFIG options under varying workloads.
5) Linus releases a final 3.x version - another substantial bump in the number of testers
because there are lots of people who wait for "release" quality kernels.
6) Fedora, Ubuntu etc. use this 3.x kernel as basis for a release. Probably two or three
orders of magnitude more users (but only a fraction of their problems are reported
back to LKML).
Thus code does get more and more QA - the longer you wait before taking a patch the
lower the risk that it has some unintended side-effect or outright bug . But of course
you are vulnerable in this whole period to whatever issue the patch was actually
trying to fix. So you have a classic tradeoff.
-Tony
next prev parent reply other threads:[~2013-07-16 17:59 UTC|newest]
Thread overview: 136+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-11 22:01 [ 00/19] 3.10.1-stable review Greg Kroah-Hartman
2013-07-11 22:01 ` [ 01/19] libceph: Fix NULL pointer dereference in auth client code Greg Kroah-Hartman
2013-07-11 22:01 ` [ 02/19] ceph: fix sleeping function called from invalid context Greg Kroah-Hartman
2013-07-11 22:01 ` [ 03/19] libceph: fix invalid unsigned->signed conversion for timespec encoding Greg Kroah-Hartman
2013-07-11 22:01 ` [ 04/19] drivers/cdrom/cdrom.c: use kzalloc() for failing hardware Greg Kroah-Hartman
2013-07-11 22:01 ` [ 05/19] module: do percpu allocation after uniqueness check. No, really! Greg Kroah-Hartman
2013-07-11 22:01 ` [ 06/19] charger-manager: Ensure event is not used as format string Greg Kroah-Hartman
2013-07-11 22:01 ` [ 07/19] hpfs: better test for errors Greg Kroah-Hartman
2013-07-11 22:01 ` [ 08/19] block: do not pass disk names as format strings Greg Kroah-Hartman
2013-07-11 22:01 ` [ 09/19] crypto: sanitize argument for format string Greg Kroah-Hartman
2013-07-11 22:01 ` Greg Kroah-Hartman
2013-07-11 22:01 ` [ 10/19] MAINTAINERS: add stable_kernel_rules.txt to stable maintainer information Greg Kroah-Hartman
2013-07-11 22:01 ` [ 11/19] futex: Take hugepages into account when generating futex_key Greg Kroah-Hartman
2013-07-11 22:01 ` [ 12/19] tty: Reset itty for other pty Greg Kroah-Hartman
2013-07-11 22:01 ` [ 13/19] Revert "serial: 8250_pci: add support for another kind of NetMos Technology PCI 9835 Multi-I/O Controller" Greg Kroah-Hartman
2013-07-11 22:01 ` [ 14/19] NFSv4.1 end back channel session draining Greg Kroah-Hartman
2013-07-11 22:01 ` [ 15/19] nfsd4: fix decoding of compounds across page boundaries Greg Kroah-Hartman
2013-07-11 22:01 ` [ 16/19] KVM: VMX: mark unusable segment as nonpresent Greg Kroah-Hartman
2013-07-11 22:01 ` [ 17/19] SCSI: sd: Fix parsing of temporary cache mode prefix Greg Kroah-Hartman
2013-07-11 22:01 ` [ 18/19] cpufreq: Fix cpufreq regression after suspend/resume Greg Kroah-Hartman
2013-07-11 22:01 ` [ 19/19] Revert "memcg: avoid dangling reference count in creation failure" Greg Kroah-Hartman
2013-07-11 22:14 ` [ 00/19] 3.10.1-stable review Josh Boyer
2013-07-14 22:54 ` Benjamin Herrenschmidt
2013-07-11 22:29 ` Dave Jones
2013-07-11 22:44 ` Greg Kroah-Hartman
2013-07-12 1:51 ` Steven Rostedt
2013-07-12 14:15 ` Guenter Roeck
2013-07-12 15:22 ` Linus Torvalds
2013-07-12 15:47 ` Steven Rostedt
2013-07-12 15:55 ` Linus Torvalds
2013-07-12 16:17 ` Ingo Molnar
2013-07-12 16:35 ` Josh Boyer
2013-07-12 16:36 ` Josh Boyer
2013-07-12 17:05 ` Greg Kroah-Hartman
2013-07-14 22:40 ` Benjamin Herrenschmidt
2013-07-12 16:48 ` Steven Rostedt
2013-07-12 17:31 ` Guenter Roeck
2013-07-12 17:50 ` Linus Torvalds
2013-07-12 18:11 ` Guenter Roeck
2013-07-12 19:35 ` Theodore Ts'o
2013-07-12 19:49 ` Steven Rostedt
2013-07-12 19:55 ` Willy Tarreau
2013-07-12 20:19 ` Dave Jones
2013-07-12 20:28 ` Steven Rostedt
2013-07-12 20:31 ` Steven Rostedt
2013-07-12 21:19 ` Justin M. Forbes
2013-07-13 0:47 ` Jochen Striepe
2013-07-13 11:11 ` Steven Rostedt
2013-07-13 15:10 ` Dave Jones
2013-07-13 15:54 ` Steven Rostedt
2013-07-12 19:50 ` Willy Tarreau
2013-07-12 20:47 ` Theodore Ts'o
2013-07-12 21:02 ` Guenter Roeck
2013-07-13 6:22 ` Greg Kroah-Hartman
2013-07-13 6:36 ` Willy Tarreau
2013-07-13 6:48 ` Greg Kroah-Hartman
2013-07-13 7:12 ` Willy Tarreau
2013-07-15 4:12 ` Li Zefan
2013-07-15 4:43 ` Willy Tarreau
2013-07-13 11:42 ` Theodore Ts'o
2013-07-13 18:27 ` Greg Kroah-Hartman
2013-07-14 2:22 ` Theodore Ts'o
2013-07-14 3:51 ` Greg Kroah-Hartman
2013-07-14 5:24 ` Guenter Roeck
2013-07-14 20:31 ` Geert Uytterhoeven
2013-07-13 6:43 ` Guenter Roeck
2013-07-13 6:58 ` Greg Kroah-Hartman
2013-07-14 23:52 ` Benjamin Herrenschmidt
2013-07-15 1:40 ` Linus Torvalds
2013-07-15 2:08 ` Benjamin Herrenschmidt
2013-07-14 22:58 ` Benjamin Herrenschmidt
2013-07-12 0:50 ` When to push bug fixes to mainline Theodore Ts'o
2013-07-12 1:20 ` [Ksummit-2013-discuss] " Nicholas A. Bellinger
2013-07-12 1:54 ` Steven Rostedt
2013-07-12 9:46 ` Jiri Kosina
2013-07-12 11:19 ` Josh Boyer
2013-07-12 2:57 ` John W. Linville
2013-07-12 3:34 ` Greg Kroah-Hartman
2013-07-12 7:32 ` James Bottomley
2013-07-12 17:20 ` H. Peter Anvin
2013-07-12 17:28 ` Greg Kroah-Hartman
2013-07-12 17:50 ` Steven Rostedt
2013-07-12 17:59 ` Linus Torvalds
2013-07-12 18:14 ` Steven Rostedt
2013-07-13 17:52 ` Geert Uytterhoeven
2013-07-12 17:57 ` Theodore Ts'o
2013-07-12 18:13 ` Guenter Roeck
2013-07-12 18:16 ` H. Peter Anvin
2013-07-12 18:28 ` H. Peter Anvin
2013-07-12 19:44 ` Linus Torvalds
2013-07-12 19:53 ` Steven Rostedt
2013-07-12 20:09 ` Shuah Khan
2013-07-12 20:33 ` Greg Kroah-Hartman
2013-07-12 20:46 ` Steven Rostedt
2013-07-12 22:19 ` H. Peter Anvin
2013-07-12 22:17 ` H. Peter Anvin
2013-07-13 6:44 ` Ingo Molnar
2013-07-13 0:24 ` Rafael J. Wysocki
2013-07-13 1:32 ` Greg Kroah-Hartman
2013-07-13 12:16 ` Rafael J. Wysocki
2013-07-12 3:25 ` Li Zefan
2013-07-15 4:22 ` Rob Landley
2013-07-12 5:14 ` Willy Tarreau
2013-07-16 7:19 ` David Lang
2013-07-16 16:40 ` [Ksummit-2013-discuss] " Takashi Iwai
2013-07-16 16:42 ` David Lang
2013-07-16 19:29 ` Takashi Iwai
2013-07-16 16:59 ` Mark Brown
2013-07-16 17:58 ` Luck, Tony [this message]
2013-07-16 17:58 ` Luck, Tony
2013-07-16 18:29 ` Linus Torvalds
2013-07-16 18:29 ` Linus Torvalds
2013-07-16 18:41 ` Steven Rostedt
2013-07-16 18:41 ` Steven Rostedt
2013-07-16 19:11 ` Greg Kroah-Hartman
2013-07-16 19:11 ` Greg Kroah-Hartman
2013-07-16 19:43 ` Steven Rostedt
2013-07-16 19:43 ` Steven Rostedt
2013-07-16 20:10 ` Willy Tarreau
2013-07-16 20:10 ` Willy Tarreau
2013-07-17 2:58 ` Ben Hutchings
2013-07-17 2:58 ` Ben Hutchings
2013-07-17 9:43 ` Li Zefan
2013-07-17 9:43 ` Li Zefan
2013-07-16 18:48 ` Willy Tarreau
2013-07-16 18:48 ` Willy Tarreau
2013-07-19 10:13 ` Ingo Molnar
2013-07-19 10:13 ` Ingo Molnar
2013-07-16 18:39 ` Willy Tarreau
2013-07-16 18:40 ` H. Peter Anvin
2013-07-16 20:29 ` David Lang
2013-07-12 17:11 ` H. Peter Anvin
2013-07-12 17:20 ` [ 00/19] 3.10.1-stable review Shuah Khan
2013-07-12 17:29 ` Greg Kroah-Hartman
2013-07-13 4:14 ` Satoru Takeuchi
2013-07-14 23:06 ` Benjamin Herrenschmidt
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