Thread (33 messages) 33 messages, 7 authors, 2011-10-02

Re: [PATCH 0/5] Reduce cross CPU IPI interference

From: Peter Zijlstra <hidden>
Date: 2011-09-26 08:46:52
Also in: lkml

On Mon, 2011-09-26 at 11:43 +0300, Gilad Ben-Yossef wrote:
On Mon, Sep 26, 2011 at 10:20 AM, Peter Zijlstra [off-list ref] wrote:
quoted
On Sun, 2011-09-25 at 11:54 +0300, Gilad Ben-Yossef wrote:
quoted
This first version creates an on_each_cpu_mask infrastructure API
But we already have the existing smp_call_function_many() doing that.
I might be wrong but my understanding is that smp_call_function_many()
does not invoke the IPI handler on the current processor. The original
code I replaced uses on_each_cpu() which does, so I figured a wrapper
was in order and then I discovered the same wrapper in arch specific
code.
quoted
The on_each_cpu() thing is mostly a hysterical relic and could be
completely depricated
Wont this require each caller to call smp_call_function_* and then
check to see if it needs to also invoke the IPI handler locally ? I
thought that was the reason for on_each_cpu existence... What have I
missed?
Gah, you're right.. early.. tea.. more. 

Looks fine then.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help