Re: [PATCH 0/5] Reduce cross CPU IPI interference
From: Peter Zijlstra <hidden>
Date: 2011-09-26 08:46:52
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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 APIBut 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 depricatedWont 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>