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* Linux 2.6.38-rc1
@ 2011-01-18 23:54 Linus Torvalds
  2011-01-19  2:07 ` Linus Torvalds
                   ` (4 more replies)
  0 siblings, 5 replies; 73+ messages in thread
From: Linus Torvalds @ 2011-01-18 23:54 UTC (permalink / raw)
  To: Linux Kernel Mailing List

It's been two weeks, and the merge window for 2.6.38 is thus closed.
And an interesting merge window it has been.

This merge window saw the introduction of two of my favorite new features:

 - the use of group scheduling to give nicer interactive behavior in
the presence of "traditional" UNIX loads (ie terminal windows with
heavy loads like a "make -j8" or similar) by giving tty sessions
separate groups (the SCHED_AUTOGROUP config variable)

 - Nick's new (well, "new" - it's been brewing for a long time)
RCU-based path name lookup.

So the autogroup thing is really more of a technical gimmick than
anything else, but it really works very well for the kinds of things
it is designed for. If you still do "real work" in a terminal window,
you're likely to appreciate it. Compile in parallel in one window,
watch a movie in another, and the movie is really smooth. It can be
very noticeable indeed. It's not a panacea, but it's nice for what it
is.

The RCU-based name lookup is at the other end of the spectrum - the
absolute anti-gimmick. It's some seriously good stuff, and gets rid of
the last main global lock that really tends to hurt some kernel loads.
The dentry lock is no longer a big serializing issue. What's really
nice about it is that it actually improves performance a lot even for
single-threaded loads (on an SMP kernel), because it gets rid of some
of the most expensive parts of path component lookup, which was the
d_lock on every component lookup. So I'm seeing improvements of 30-50%
on some seriously pathname-lookup intensive loads.

So last cycle, we got rid of most of the BKL - which was really nice,
but practically speaking it was not a very important lock any more.
This cycle was different: Nick's series (and thanks to everybody else
who helped) really help a very real scalability and performance issue.
And we used to be rather good at pathname lookup before - now we're
just a whole lot better.

Now, those two are my personal favorites, but that's not to say that
you may care. Not all loads are all that name-lookup heavy, and the
scheduler auto-grouping may not matter for you. So to round the thing
up, we have a metric ton of other features, with drivers as usual
accounting for about half of the changes. The most noticeable part
during the merge window was the DRI updates, which caused some pain.
The most obvious fallout of that should all have been fixed, and we
should now have support for the AMD Fusion stuff along with some Fermi
acceleration support. And several updates to the Intel driver too.

But never fear. If you don't care about pathname lookup, scheduling or
graphics cards, I'm sure you can find changes to be excited about,
whatever your area of interest is. SCSI target infrastructure? Or all
the architecture updates (notably ARM and blackfin platform
additions)? Or just the sound and media drivers? Go look at your
favorite area in the git tree, I suspect it has gotten some love.

And as usual, report any regressions to the lists and the appropriate
authorities.

                    Linus

^ permalink raw reply	[flat|nested] 73+ messages in thread
* Re: Linux 2.6.38-rc1 doesn't boot
@ 2011-01-19  8:32 Sedat Dilek
  2011-01-19 12:31 ` H.J. Lu
  0 siblings, 1 reply; 73+ messages in thread
From: Sedat Dilek @ 2011-01-19  8:32 UTC (permalink / raw)
  To: Markus Trippelsdorf
  Cc: LKML, Linus Torvalds, H.J. Lu, Shaohua Li, Matthias Klose

Referring to the original posting from [1]:

I am on latest linux-next (next-20110118) which has also [3] included,
x86_32 and using binutils-2.21 with PR ld/12327 fix from
Debian/experimental (see [2]).

AFAICS the changes to my kernel-config... You are on x86_64 and have not set:

CONFIG_RELOCATABLE=y
CONFIG_X86_NEED_RELOCS=y

Ifdef *also* for CONFIG_RELOCATABLE for the parts in commit from [3] ?

- Sedat -

[1] http://lkml.org/lkml/2011/1/19/52
[2] http://bazaar.launchpad.net/~doko/binutils/pkg-2.21-debian/revision/85
[3] http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commit;h=86b1e8dd83cbb0

^ permalink raw reply	[flat|nested] 73+ messages in thread
* RE: Linux 2.6.38-rc1 doesn't boot
@ 2011-01-21 16:06 Anvin, H Peter
  0 siblings, 0 replies; 73+ messages in thread
From: Anvin, H Peter @ 2011-01-21 16:06 UTC (permalink / raw)
  To: Lu, Hongjiu, Li, Shaohua
  Cc: 'mingo@elte.hu', 'markus@trippelsdorf.de',
	'torvalds@linux-foundation.org',
	'linux-kernel@vger.kernel.org',
	'sam@ravnborg.org'

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="utf-8", Size: 1574 bytes --]

That is surprisingly painful, which is why the high frequency of binutils bugs is a major headache to us in the kernel world.  Either way the  current code is just hacky.

-- 
Sent with Good (www.good.com)


 -----Original Message-----
From: 	Lu, Hongjiu
Sent:	Friday, January 21, 2011 07:37 AM Pacific Standard Time
To:	Anvin, H Peter; Li, Shaohua
Cc:	Ingo Molnar; Markus Trippelsdorf; Linus Torvalds; Linux Kernel Mailing List; Sam Ravnborg
Subject:	RE: Linux 2.6.38-rc1 doesn't boot

Or we can just ban those broken linker versions.

H.J.


> -----Original Message-----
> From: Anvin, H Peter
> Sent: Friday, January 21, 2011 7:29 AM
> To: Li, Shaohua
> Cc: Ingo Molnar; Markus Trippelsdorf; Lu, Hongjiu; Linus Torvalds;
> Linux Kernel Mailing List; Sam Ravnborg
> Subject: Re: Linux 2.6.38-rc1 doesn't boot
> 
> On 01/20/2011 11:18 PM, Li, Shaohua wrote:
> >  		*(.jiffies)
> >  	}
> >  	jiffies = VVIRT(.jiffies);
> > +	jiffies_64 = jiffies;
> >
> 
> OK, this is just messed up.  If we need jiffies in a special section
> then we should declare it as such (see __jiffy_data), but it's not
> clear
> to me why we would.  This seems like hack upon hack.
> 
> However, I suspect we may want to put jiffies into a .S file, and that
> .S file needs to take into account architectures which need underscore
> prefixes (which really sucks to have in ELF and is a major fail on
> those
> ABI designers...)
> 
> 	-hpa
ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥

^ permalink raw reply	[flat|nested] 73+ messages in thread

end of thread, other threads:[~2011-01-25  0:19 UTC | newest]

Thread overview: 73+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-01-18 23:54 Linux 2.6.38-rc1 Linus Torvalds
2011-01-19  2:07 ` Linus Torvalds
2011-01-19  3:42   ` Justin Mattock
2011-01-19  3:53     ` Linus Torvalds
2011-01-19  4:05       ` Justin Mattock
2011-01-19  5:10       ` nobody
2011-01-19  5:42         ` Linus Torvalds
2011-01-19  5:56           ` Linus Torvalds
2011-01-19 18:07             ` Steven Rostedt
2011-01-19 18:26               ` Linus Torvalds
2011-01-21  3:23           ` tag&track [Re: Linux 2.6.38-rc1] nobody
2011-01-21  8:24             ` Alexey Dobriyan
2011-01-23  8:13   ` Linux 2.6.38-rc1 Török Edwin
2011-01-19  7:39 ` Linux 2.6.38-rc1 doesn't boot Markus Trippelsdorf
2011-01-19  7:46   ` Shaohua Li
2011-01-19  7:55     ` Markus Trippelsdorf
2011-01-19  7:49   ` Markus Trippelsdorf
2011-01-19  8:12     ` Shaohua Li
2011-01-19  8:56       ` H. Peter Anvin
2011-01-19  9:09         ` Ingo Molnar
2011-01-20  2:08           ` Shaohua Li
2011-01-20  3:32             ` Lu, Hongjiu
2011-01-20 11:25             ` Ingo Molnar
2011-01-20 15:08               ` Anvin, H Peter
2011-01-21  7:18                 ` Shaohua Li
2011-01-21  7:55                   ` Shaohua Li
2011-01-21 15:28                   ` H. Peter Anvin
2011-01-21 15:37                     ` Lu, Hongjiu
2011-01-21 21:09                       ` Ingo Molnar
2011-01-19  9:33         ` [tip:x86/urgent] Revert "x86: Make relocatable kernel work with new binutils" tip-bot for Ingo Molnar
2011-01-20  4:59     ` Linux 2.6.38-rc1 doesn't boot Alexandre Courbot
2011-01-19  8:39 ` PPS parport boot lockup: INFO: HARDIRQ-READ-safe -> HARDIRQ-READ-unsafe lock order detected Ingo Molnar
2011-01-20 13:04   ` Alexander Gordeev
2011-01-21 14:44   ` Alexander Gordeev
2011-01-21 16:37     ` Linus Torvalds
2011-01-21 19:43       ` Ingo Molnar
2011-01-24 23:28         ` Alexander Gordeev
2011-01-24 23:46         ` [PATCH] pps: claim parallel port exclusively Alexander Gordeev
2011-01-25  0:19           ` Ingo Molnar
2011-01-24 15:00       ` PPS parport boot lockup: INFO: HARDIRQ-READ-safe -> HARDIRQ-READ-unsafe lock order detected Alexander Gordeev
2011-01-24 15:12   ` [PATCH] parport: make lockdep happy with waitlist_lock Alexander Gordeev
2011-01-24 15:28     ` Ingo Molnar
2011-01-24 15:33       ` Alexander Gordeev
2011-01-19 12:02 ` percpu related boot crash on x86 (was: Linux 2.6.38-rc1) Ingo Molnar
2011-01-19 12:44   ` Tejun Heo
2011-01-19 12:48   ` Peter Zijlstra
2011-01-19 12:56     ` Pekka Enberg
2011-01-19 13:12       ` Peter Zijlstra
2011-01-19 13:13       ` Tejun Heo
2011-01-19 20:53         ` Ingo Molnar
2011-01-19 23:11           ` Ingo Molnar
2011-01-20  8:31             ` percpu related boot crash on x86 Pekka Enberg
2011-01-20 10:47               ` Peter Zijlstra
2011-01-20 11:12                 ` Eric Dumazet
2011-01-20 11:19                   ` Tejun Heo
2011-01-20 11:06   ` [PATCH 1/2] lockdep: move early boot local IRQ enable/disable status to init/main.c Tejun Heo
2011-01-20 11:07     ` [PATCH 2/2] smp: allow on_each_cpu() to be called while early_boot_irqs_disabled " Tejun Heo
2011-01-20 20:22       ` [tip:core/urgent] smp: Allow " tip-bot for Tejun Heo
2011-01-20 11:11     ` [PATCH 1/2] lockdep: move early boot local IRQ enable/disable " Tejun Heo
2011-01-20 11:23       ` Peter Zijlstra
2011-01-20 11:26         ` Tejun Heo
2011-01-20 11:30           ` Pekka Enberg
2011-01-20 11:38           ` Peter Zijlstra
2011-01-20 12:00       ` Ingo Molnar
2011-01-20 12:20         ` [PATCH UPDATED " Tejun Heo
2011-01-20 11:51     ` [PATCH " Ingo Molnar
2011-01-20 20:21     ` [tip:core/urgent] lockdep: Move " tip-bot for Tejun Heo
2011-01-19 21:40 ` Linux 2.6.38-rc1 Alan Cox
2011-01-21 15:30   ` Aaro Koskinen
2011-01-19  8:32 Linux 2.6.38-rc1 doesn't boot Sedat Dilek
2011-01-19 12:31 ` H.J. Lu
2011-01-19 14:03   ` Jeff Chua
2011-01-21 16:06 Anvin, H Peter

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