From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Yinghai Lu <yinghai@kernel.org>,
Jesse Brandeburg <jesse.brandeburg@gmail.com>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
NetDEV list <netdev@vger.kernel.org>,
Jesse Brandeburg <jesse.brandeburg@intel.com>
Subject: Re: Subject: [PATCH 1/2] x86: get back 15 vectors
Date: Mon, 04 Jan 2010 11:01:28 -0800 [thread overview]
Message-ID: <4B423B08.3010005@zytor.com> (raw)
In-Reply-To: <m1aawtlu6y.fsf@fess.ebiederm.org>
On 01/04/2010 08:18 AM, Eric W. Biederman wrote:
> Yinghai Lu <yinghai@kernel.org> writes:
>
> This patch is wrong.
>
>> between FIRST_EXTERNAL_VECTOR (0x20) and FIRST_DEVICE_VECTOR (0x41)
>>
>> for 0x20 and 0x2f, we are safe be used_vectors will prevent it to use used one.
>
> We can not use any of 0x20 - 0x2f for ioapic irqs. We need the entire
> priority level to ensure that the irq move cleanup ipi is of a lower
> priority.
>
Almost makes one want to abuse 0x1f for that. Although 0x00..0x1f are
reserved for exceptions, the APICs range down to 0x10, and well, when
0x1f ends up actually getting used as an exception vector that we
support, then we can trivially change that. In the meantime it would
actually make use of an otherwise-unusable APIC priority level.
-hpa
next prev parent reply other threads:[~2010-01-04 19:03 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-25 8:42 [PATCH] x86: increase NR_IRQS and nr_irqs Yinghai Lu
2009-12-28 9:47 ` Ingo Molnar
2009-12-29 5:08 ` [PATCH -v2] " Yinghai Lu
2009-12-30 12:21 ` [tip:x86/apic] x86: Increase " tip-bot for Yinghai Lu
2010-01-04 3:06 ` [PATCH -v2] x86: increase " Jesse Brandeburg
2010-01-04 3:20 ` Yinghai Lu
2010-01-04 6:56 ` Subject: [PATCH 1/2] x86: get back 15 vectors Yinghai Lu
2010-01-04 16:18 ` Eric W. Biederman
2010-01-04 18:40 ` Yinghai Lu
2010-01-04 19:04 ` Eric W. Biederman
2010-01-04 19:14 ` H. Peter Anvin
2010-01-04 19:01 ` H. Peter Anvin [this message]
2010-01-04 19:09 ` Eric W. Biederman
2010-01-04 19:35 ` Yinghai Lu
2010-01-04 19:45 ` Suresh Siddha
2010-01-04 19:50 ` H. Peter Anvin
2010-01-05 0:05 ` Suresh Siddha
2010-01-05 0:16 ` Yinghai Lu
2010-01-05 5:30 ` [tip:x86/apic] x86, apic: Reclaim IDT vectors 0x20-0x2f tip-bot for H. Peter Anvin
2010-01-04 19:48 ` Subject: [PATCH 1/2] x86: get back 15 vectors H. Peter Anvin
2010-01-04 20:06 ` Yinghai Lu
2010-01-04 20:14 ` Eric W. Biederman
2010-01-04 20:33 ` Yinghai Lu
2010-01-04 21:10 ` H. Peter Anvin
2010-01-04 21:20 ` Yinghai Lu
2010-01-04 21:33 ` H. Peter Anvin
2010-01-04 22:01 ` Yinghai Lu
2010-01-04 23:03 ` H. Peter Anvin
2010-01-04 23:32 ` Yinghai Lu
2010-01-04 23:38 ` H. Peter Anvin
2010-01-04 23:42 ` Yinghai Lu
2010-01-04 23:49 ` Yinghai Lu
2010-01-04 23:59 ` H. Peter Anvin
2010-01-05 5:30 ` [tip:x86/apic] x86, apic: Don't waste a vector to improve vector spread tip-bot for H. Peter Anvin
2010-01-04 20:08 ` Subject: [PATCH 1/2] x86: get back 15 vectors Eric W. Biederman
2010-01-04 6:58 ` [PATCH 2/2] x86: get more exact nr_irqs Yinghai Lu
2010-01-04 16:55 ` Eric W. Biederman
2010-01-04 19:03 ` Yinghai Lu
2010-01-04 19:16 ` Eric W. Biederman
2010-01-04 19:30 ` H. Peter Anvin
2010-01-04 19:47 ` Yinghai Lu
2010-01-04 20:05 ` Eric W. Biederman
2010-01-04 21:50 ` H. Peter Anvin
2010-01-04 6:59 ` [PATCH 1/2] x86: get back 15 vectors Yinghai Lu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4B423B08.3010005@zytor.com \
--to=hpa@zytor.com \
--cc=akpm@linux-foundation.org \
--cc=ebiederm@xmission.com \
--cc=jesse.brandeburg@gmail.com \
--cc=jesse.brandeburg@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=netdev@vger.kernel.org \
--cc=tglx@linutronix.de \
--cc=yinghai@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox