Re: [patch] Latency Tracer, voluntary-preempt-2.6.8-rc4-O6

[Lee Revell]

On Fri, 2004-08-13 at 01:27, Lee Revell wrote:
> On Thu, 2004-08-12 at 19:51, Ingo Molnar wrote:
> > i've uploaded the latest version of the voluntary-preempt patch:
> >      
> >   http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8-rc4-O6
> 

Ugh, this is a bad one:

preemption latency trace v1.0
-----------------------------
 latency: 506 us, entries: 157 (157)
 process: evolution/3461, uid: 1000
 nice: 0, policy: 0, rt_priority: 0
=======>
 0.000ms (+0.000ms): get_random_bytes (__check_and_rekey)
 0.000ms (+0.000ms): extract_entropy (get_random_bytes)
 0.002ms (+0.001ms): extract_entropy (extract_entropy)
 0.003ms (+0.001ms): SHATransform (extract_entropy)
 0.004ms (+0.000ms): memcpy (SHATransform)
 0.014ms (+0.010ms): add_entropy_words (extract_entropy)
 0.016ms (+0.002ms): SHATransform (extract_entropy)
 0.016ms (+0.000ms): memcpy (SHATransform)
 0.025ms (+0.008ms): add_entropy_words (extract_entropy)
 0.026ms (+0.000ms): SHATransform (extract_entropy)
 0.026ms (+0.000ms): memcpy (SHATransform)
 0.035ms (+0.008ms): add_entropy_words (extract_entropy)
 0.035ms (+0.000ms): SHATransform (extract_entropy)
 0.036ms (+0.000ms): memcpy (SHATransform)
 0.044ms (+0.008ms): add_entropy_words (extract_entropy)
 0.045ms (+0.000ms): SHATransform (extract_entropy)
 0.045ms (+0.000ms): memcpy (SHATransform)
 0.053ms (+0.008ms): add_entropy_words (extract_entropy)
 0.054ms (+0.000ms): SHATransform (extract_entropy)
 0.055ms (+0.000ms): memcpy (SHATransform)
 0.063ms (+0.008ms): add_entropy_words (extract_entropy)
 0.064ms (+0.000ms): SHATransform (extract_entropy)
 0.064ms (+0.000ms): memcpy (SHATransform)
 0.072ms (+0.008ms): add_entropy_words (extract_entropy)
 0.073ms (+0.000ms): SHATransform (extract_entropy)
 0.073ms (+0.000ms): memcpy (SHATransform)
 0.082ms (+0.008ms): add_entropy_words (extract_entropy)
 0.083ms (+0.001ms): SHATransform (extract_entropy)
 0.083ms (+0.000ms): memcpy (SHATransform)
 0.091ms (+0.008ms): add_entropy_words (extract_entropy)
 0.092ms (+0.000ms): SHATransform (extract_entropy)
 0.092ms (+0.000ms): memcpy (SHATransform)
 0.101ms (+0.008ms): add_entropy_words (extract_entropy)
 0.101ms (+0.000ms): SHATransform (extract_entropy)
 0.102ms (+0.000ms): memcpy (SHATransform)
 0.110ms (+0.008ms): add_entropy_words (extract_entropy)
 0.111ms (+0.000ms): SHATransform (extract_entropy)
 0.111ms (+0.000ms): memcpy (SHATransform)
 0.119ms (+0.008ms): add_entropy_words (extract_entropy)
 0.120ms (+0.000ms): SHATransform (extract_entropy)
 0.120ms (+0.000ms): memcpy (SHATransform)
 0.129ms (+0.008ms): add_entropy_words (extract_entropy)
 0.129ms (+0.000ms): SHATransform (extract_entropy)
 0.129ms (+0.000ms): memcpy (SHATransform)
 0.138ms (+0.008ms): add_entropy_words (extract_entropy)
 0.139ms (+0.000ms): SHATransform (extract_entropy)
 0.139ms (+0.000ms): memcpy (SHATransform)
 0.147ms (+0.008ms): add_entropy_words (extract_entropy)
 0.148ms (+0.000ms): SHATransform (extract_entropy)
 0.148ms (+0.000ms): memcpy (SHATransform)
 0.157ms (+0.008ms): add_entropy_words (extract_entropy)
 0.158ms (+0.000ms): SHATransform (extract_entropy)
 0.158ms (+0.000ms): memcpy (SHATransform)
 0.166ms (+0.008ms): add_entropy_words (extract_entropy)
 0.167ms (+0.000ms): SHATransform (extract_entropy)
 0.167ms (+0.000ms): memcpy (SHATransform)
 0.176ms (+0.008ms): add_entropy_words (extract_entropy)
 0.177ms (+0.000ms): SHATransform (extract_entropy)
 0.177ms (+0.000ms): memcpy (SHATransform)
 0.185ms (+0.008ms): add_entropy_words (extract_entropy)
 0.186ms (+0.000ms): SHATransform (extract_entropy)
 0.186ms (+0.000ms): memcpy (SHATransform)
 0.195ms (+0.008ms): add_entropy_words (extract_entropy)
 0.196ms (+0.000ms): SHATransform (extract_entropy)
 0.196ms (+0.000ms): memcpy (SHATransform)
 0.204ms (+0.008ms): add_entropy_words (extract_entropy)
 0.205ms (+0.000ms): SHATransform (extract_entropy)
 0.205ms (+0.000ms): memcpy (SHATransform)
 0.214ms (+0.008ms): add_entropy_words (extract_entropy)
 0.214ms (+0.000ms): SHATransform (extract_entropy)
 0.215ms (+0.000ms): memcpy (SHATransform)
 0.223ms (+0.008ms): add_entropy_words (extract_entropy)
 0.224ms (+0.000ms): SHATransform (extract_entropy)
 0.224ms (+0.000ms): memcpy (SHATransform)
 0.233ms (+0.008ms): add_entropy_words (extract_entropy)
 0.234ms (+0.001ms): SHATransform (extract_entropy)
 0.234ms (+0.000ms): memcpy (SHATransform)
 0.242ms (+0.008ms): add_entropy_words (extract_entropy)
 0.243ms (+0.000ms): SHATransform (extract_entropy)
 0.243ms (+0.000ms): memcpy (SHATransform)
 0.252ms (+0.008ms): add_entropy_words (extract_entropy)
 0.252ms (+0.000ms): SHATransform (extract_entropy)
 0.253ms (+0.000ms): memcpy (SHATransform)
 0.261ms (+0.008ms): add_entropy_words (extract_entropy)
 0.262ms (+0.000ms): SHATransform (extract_entropy)
 0.262ms (+0.000ms): memcpy (SHATransform)
 0.271ms (+0.008ms): add_entropy_words (extract_entropy)
 0.271ms (+0.000ms): SHATransform (extract_entropy)
 0.272ms (+0.000ms): memcpy (SHATransform)
 0.280ms (+0.008ms): add_entropy_words (extract_entropy)
 0.281ms (+0.000ms): SHATransform (extract_entropy)
 0.281ms (+0.000ms): memcpy (SHATransform)
 0.289ms (+0.008ms): add_entropy_words (extract_entropy)
 0.290ms (+0.000ms): SHATransform (extract_entropy)
 0.290ms (+0.000ms): memcpy (SHATransform)
 0.299ms (+0.008ms): add_entropy_words (extract_entropy)
 0.300ms (+0.000ms): SHATransform (extract_entropy)
 0.300ms (+0.000ms): memcpy (SHATransform)
 0.308ms (+0.008ms): add_entropy_words (extract_entropy)
 0.309ms (+0.000ms): SHATransform (extract_entropy)
 0.309ms (+0.000ms): memcpy (SHATransform)
 0.318ms (+0.008ms): add_entropy_words (extract_entropy)
 0.319ms (+0.000ms): SHATransform (extract_entropy)
 0.319ms (+0.000ms): memcpy (SHATransform)
 0.327ms (+0.008ms): add_entropy_words (extract_entropy)
 0.328ms (+0.000ms): SHATransform (extract_entropy)
 0.328ms (+0.000ms): memcpy (SHATransform)
 0.337ms (+0.008ms): add_entropy_words (extract_entropy)
 0.338ms (+0.000ms): SHATransform (extract_entropy)
 0.338ms (+0.000ms): memcpy (SHATransform)
 0.346ms (+0.008ms): add_entropy_words (extract_entropy)
 0.347ms (+0.000ms): SHATransform (extract_entropy)
 0.347ms (+0.000ms): memcpy (SHATransform)
 0.356ms (+0.008ms): add_entropy_words (extract_entropy)
 0.356ms (+0.000ms): SHATransform (extract_entropy)
 0.357ms (+0.000ms): memcpy (SHATransform)
 0.365ms (+0.008ms): add_entropy_words (extract_entropy)
 0.366ms (+0.000ms): SHATransform (extract_entropy)
 0.366ms (+0.000ms): memcpy (SHATransform)
 0.375ms (+0.008ms): add_entropy_words (extract_entropy)
 0.375ms (+0.000ms): SHATransform (extract_entropy)
 0.376ms (+0.000ms): memcpy (SHATransform)
 0.384ms (+0.008ms): add_entropy_words (extract_entropy)
 0.385ms (+0.001ms): add_entropy_words (extract_entropy)
 0.396ms (+0.010ms): credit_entropy_store (extract_entropy)
 0.397ms (+0.001ms): SHATransform (extract_entropy)
 0.397ms (+0.000ms): memcpy (SHATransform)
 0.405ms (+0.008ms): add_entropy_words (extract_entropy)
 0.406ms (+0.000ms): SHATransform (extract_entropy)
 0.407ms (+0.000ms): memcpy (SHATransform)
 0.415ms (+0.008ms): add_entropy_words (extract_entropy)
 0.416ms (+0.001ms): SHATransform (extract_entropy)
 0.416ms (+0.000ms): memcpy (SHATransform)
 0.425ms (+0.008ms): add_entropy_words (extract_entropy)
 0.425ms (+0.000ms): SHATransform (extract_entropy)
 0.426ms (+0.000ms): memcpy (SHATransform)
 0.434ms (+0.008ms): add_entropy_words (extract_entropy)
 0.435ms (+0.001ms): SHATransform (extract_entropy)
 0.436ms (+0.000ms): memcpy (SHATransform)
 0.444ms (+0.008ms): add_entropy_words (extract_entropy)
 0.445ms (+0.000ms): SHATransform (extract_entropy)
 0.445ms (+0.000ms): memcpy (SHATransform)
 0.453ms (+0.008ms): add_entropy_words (extract_entropy)
 0.455ms (+0.001ms): SHATransform (extract_entropy)
 0.455ms (+0.000ms): memcpy (SHATransform)
 0.463ms (+0.008ms): add_entropy_words (extract_entropy)
 0.464ms (+0.000ms): SHATransform (extract_entropy)
 0.464ms (+0.000ms): memcpy (SHATransform)
 0.473ms (+0.008ms): add_entropy_words (extract_entropy)
 0.474ms (+0.001ms): SHATransform (extract_entropy)
 0.474ms (+0.000ms): memcpy (SHATransform)
 0.482ms (+0.008ms): add_entropy_words (extract_entropy)
 0.483ms (+0.000ms): SHATransform (extract_entropy)
 0.483ms (+0.000ms): memcpy (SHATransform)
 0.492ms (+0.008ms): add_entropy_words (extract_entropy)
 0.493ms (+0.001ms): local_bh_enable (__check_and_rekey)
 0.494ms (+0.000ms): check_preempt_timing (sub_preempt_count)

Lee

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