Stephane Eranian wrote:
Will,
On Tue, Feb 13, 2007 at 01:14:19PM -0500, William Cohen wrote:
I have decided to make a pre-release of my 2.6.20 perfmon2 kernel patch.
It has been a very busy week chasing bugs on x86 and ia-64. I fixed a
serious deadlock condition in pfm_restart() today.
Before making a broader announce, and because I know many of you have been
awaiting this release, I have decided to release what I have so far.
I encourage you to test it and stress it. There may still be an issue that
I
need to chase down, that is why a make a limited release.
There are no new feature in this release, simply some code restructuring
especially with the arch-specific layer. Several important bugs have been
fixed related to set switching and in-flight interrupts.
Please try it out, and report any suspicious results.
Hopefully by next week, we'll have something that I can release to the
wider audience.
You can grab the pre-release at:
ftp://ftp.hpl.hp.com/pub/linux-ia64/perfmon-new-base-070209.tar.gz
MD5SUM: a4aec4a65de1cdb137d26313713e52c4
Thanks.
Starting to look over the patch for the 2.6.20 kernel.
In base.diff is the reason there are not matching enter_idle() in the
various functions x86_64 and i386 is because the loop in cpu_idle()
has the enter_idle()? I noticed that the ia64 code had matching
exit_idle() and enter_idle().
I think you are asking why we have enter_idle()/__enter_idle()
and just __exit_idle()?
- enter_idle() is used in all first level interrupt handler. It is only
useful when call by the idle thread, so this function checks pid
- __enter_idle() is a simplified version of the above without the pid
check because
we know it is ONLY called by the idle thread
- __exit_idle() is ONLY called from the idle thread
On IA-64, we need the exit/enter idle outside the idle loop. But I need to
double-check that
once again.
The base.diff patch adds exit_idle() to a number of functions, e.g.
smp_apic_timer_interrupt() and smp_spurious_interrupt(). But there are not
maching enter_idle() calls in those functions for x86_64 or i386.
-Will
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