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From: Ingo Molnar <mingo@elte.hu>
To: Daniel Walker <dwalker@mvista.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Andrew Morton <akpm@osdl.org>,
	linux-kernel@vger.kernel.org
Subject: Re: 2.6.20-rc6-mm3
Date: Tue, 6 Feb 2007 22:41:31 +0100	[thread overview]
Message-ID: <20070206214131.GA1176@elte.hu> (raw)
In-Reply-To: <1170796999.3455.43.camel@dwalker1>


* Daniel Walker <dwalker@mvista.com> wrote:

> > we could make this clearer by renaming 'LOC' (which stands for 
> > 'LOCal timer interupts' and was added [and misnamed] by yours truly 
> > many moons ago) to 'apic-timer' and 'timer' to 'PIT-timer' but 
> > /that/ would be more of a userspace visible change than the change 
> > in the counter rates.
> 
> If we change the current "timer" entry to be listed as "lapic-timer" 
> and not "IO-APIC-edge" (or one of the other names) and replace it with 
> the count from LOC , [...]

doing that would not fake the old behavior (which is your suggestion), 
LOC is per CPU, while the PIT timer irq that was there is global.

But, as per the previous mails, the new behavior is just fine, because 
/proc/interrupts just reflects reality. And the way the kernel utilizes 
the hardware has just changed - for the better.

The same happens when say a network driver implements NAPI: the IRQ 
count goes way, way down. Or if a driver starts supporing MSI - the IRQ 
line even moves to another one. Do we try to fix those counts up to 
match the 'previous behavior'? Of course not. What you are suggesting 
makes no sense, is against current kernel practices - as we pointed it 
out to you 7 mails ago.

> [...] that would make sense cause that field already changes depending 
> if you have a io-apic or not ..

(that is something else: it's different because a different irq-chip is 
behind it.)

	Ingo

  reply	other threads:[~2007-02-06 21:41 UTC|newest]

Thread overview: 124+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-30  4:45 2.6.20-rc6-mm3 Andrew Morton
2007-01-30  4:50 ` 2.6.20-rc6-mm3 Jeff Garzik
2007-01-30  5:11   ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-30  9:56     ` 2.6.20-rc6-mm3 Evgeniy Polyakov
2007-01-30  8:16 ` 2.6.20-rc6-mm3 Sunil Naidu
2007-01-30  8:32   ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-30  9:06 ` 2.6.20-rc6-mm3 Olivier Galibert
2007-01-30  9:26   ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-30 18:47     ` 2.6.20-rc6-mm3 Olivier Galibert
2007-01-31  7:57     ` 2.6.20-rc6-mm3 Len Brown
2007-02-01  4:25     ` 2.6.20-rc6-mm3 Len Brown
2007-01-30 22:18 ` 2.6.20-rc6-mm3 Maciej Rutecki
2007-01-30 22:27   ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-31  0:55     ` 2.6.20-rc6-mm3 Karsten Wiese
2007-01-31 13:22       ` 2.6.20-rc6-mm3 Ingo Molnar
2007-01-31 14:25         ` 2.6.20-rc6-mm3 Karsten Wiese
2007-02-01  8:01           ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-01 10:44             ` 2.6.20-rc6-mm3 Karsten Wiese
2007-03-01 11:11               ` 2.6.20-rc6-mm3 Karsten Wiese
2007-02-03  0:37             ` 2.6.20-rc6-mm3 Pavel Machek
2007-02-01 13:03       ` [PATCH -mm] gtod persistent clock resume fix Thomas Gleixner
2007-01-31 11:54     ` 2.6.20-rc6-mm3 Maciej Rutecki
2007-02-01  4:10       ` 2.6.20-rc6-mm3 Len Brown
2007-02-01  4:17         ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-31  1:16   ` 2.6.20-rc6-mm3 Tilman Schmidt
2007-01-31  1:25     ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-31 11:38       ` 2.6.20-rc6-mm3 Tilman Schmidt
2007-01-31 12:29         ` 2.6.20-rc6-mm3 Alexey Starikovskiy
2007-01-31 16:02           ` 2.6.20-rc6-mm3 Maciej Rutecki
2007-01-31 18:28           ` 2.6.20-rc6-mm3 Tilman Schmidt
2007-01-31 21:52 ` 2.6.20-rc6-mm3 Mattia Dongili
2007-01-31 23:21   ` 2.6.20-rc6-mm3 Mattia Dongili
2007-02-01 19:04     ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-01 19:36     ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-01 20:01       ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-01 21:11         ` 2.6.20-rc6-mm3 Mattia Dongili
2007-02-01 22:33           ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-02 19:18             ` dynticks + iptables almost stops the boot process [was: Re: 2.6.20-rc6-mm3] Mattia Dongili
2007-02-02 20:27               ` Thomas Gleixner
2007-02-02 20:43                 ` Mattia Dongili
2007-02-06 16:48                   ` Ingo Molnar
2007-02-06 19:28                     ` Mattia Dongili
2007-02-06 23:12                       ` Tilman Schmidt
2007-02-06 23:17                         ` Thomas Gleixner
2007-02-07  1:01                           ` Andrew Morton
2007-02-07 19:33                             ` Ingo Molnar
2007-02-01 21:37         ` 2.6.20-rc6-mm3 Mattia Dongili
2007-02-01 20:24       ` 2.6.20-rc6-mm3 Mattia Dongili
2007-02-01  0:14 ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-01  0:24   ` 2.6.20-rc6-mm3 Andrew Morton
2007-02-01  0:27     ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-01  0:36       ` 2.6.20-rc6-mm3 Andrew Morton
2007-02-01  0:38         ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-01  6:20         ` 2.6.20-rc6-mm3 David Chinner
2007-02-01  7:12           ` 2.6.20-rc6-mm3 Andrew Morton
2007-02-01 19:01             ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-01 19:18               ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-01 20:18                 ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-01 20:26                   ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-01 23:02                     ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-05 12:02                       ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-05 12:17                         ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-05 12:56                           ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-05 18:20                             ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-05 18:34                               ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-02  4:08                 ` 2.6.20-rc6-mm3 David Chinner
2007-02-02  7:31                   ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-01 18:24 ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-01 19:37   ` 2.6.20-rc6-mm3 Starikovskiy, Alexey Y
2007-02-01 20:29     ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-01 20:38       ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-02 14:22         ` 2.6.20-rc6-mm3 Starikovskiy, Alexey Y
2007-02-02 14:47           ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-02 14:50             ` 2.6.20-rc6-mm3 Starikovskiy, Alexey Y
2007-02-02 16:04               ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-03  7:30                 ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-03  7:57                   ` 2.6.20-rc6-mm3 Starikovskiy, Alexey Y
2007-02-02 17:39 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 16:03 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 18:36   ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 18:45     ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 19:07       ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 19:55         ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 20:20           ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 20:40             ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 20:52               ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 20:56                 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 21:09                   ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 21:20                     ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 21:23                     ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 21:41                       ` Ingo Molnar [this message]
2007-02-06 21:54                         ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 22:08                           ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 22:42                             ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 22:56                               ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 23:04                                 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:14                                   ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 23:22                                     ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:28                                       ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 23:35                                         ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:44                                           ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 23:51                                           ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-07  2:46                                             ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:36                                       ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-07  1:12                                         ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-07 14:53                                           ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 23:37                                       ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 22:13                           ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 21:43                       ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 21:59                         ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 21:17               ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 21:25                 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:15               ` 2.6.20-rc6-mm3 Rob Landley
2007-02-06 23:28                 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:55                   ` 2.6.20-rc6-mm3 Rob Landley
2007-02-06 22:11 ` [-mm patch] #ifdef ACPI_FUTURE_USAGE acpi_os_readable() Adrian Bunk
2007-02-06 22:12 ` [RFC: -mm patch] drivers/net/atl1/: possible cleanups Adrian Bunk
2007-02-07  0:19   ` Jay Cliburn
2007-02-07  0:22     ` Jeff Garzik
2007-02-07  0:24       ` J. K. Cliburn
2007-02-07  0:24     ` Adrian Bunk
2007-02-06 22:12 ` [-mm patch] drivers/scsi/aacraid/: cleanups Adrian Bunk
2007-02-06 22:12 ` [-mm patch] make gfs2_writepages() static Adrian Bunk
2007-02-07 10:50   ` Steven Whitehouse

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