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From: Suleiman Souhlal <ssouhlal@FreeBSD.org>
To: Andi Kleen <ak@suse.de>
Cc: Linux Kernel ML <linux-kernel@vger.kernel.org>,
	vojtech@suse.cz, Jiri Bohac <jbohac@suse.cz>
Subject: [PATCH 0/1] Try 2: Make the TSC safe to be use by gettimeofday().
Date: Tue, 14 Nov 2006 15:28:47 -0800	[thread overview]
Message-ID: <455A512F.6030907@FreeBSD.org> (raw)

Hi,

Here are the fixes from the previous version:
- Don't use hard_smp_processor_id().
- Use the PDA to store a pointer to the current CPU's vxtime data.
- Use vgetcpu() to get the CPU number from vgettimeofday()
  (Due to a bug in vgetcpu(), this only works with CONFIG_HOTPLUG_CPU=y)
- No externs in .c files
- Use idle notifiers instead of doing the HPET read in switch_to
- Fix race in vgettimeofday() by checking the RIP of the process we're switching away from
  in switch_to, and touching the vxtime seqlock if it happens to be in the VSYSCALL page.
  (I hope this is not considered too much work for switch_to)
- Remove usage of preempt_disable/enable() in do_gettimeoday(), since the above fix make it
  unnecessary.

-- Suleiman


             reply	other threads:[~2006-11-14 23:28 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-11-14 23:28 Suleiman Souhlal [this message]
2006-11-14 23:36 ` [PATCH 1/1] Make the TSC safe to be used by gettimeofday() Suleiman Souhlal
2006-11-15  4:42   ` Andi Kleen
2006-11-15  7:14     ` Suleiman Souhlal
2006-11-14 23:39 ` [PATCH 0/1] Try 2: Make the TSC safe to be use " Suleiman Souhlal

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