Re: [Patch] Losing many samples when profiling multiple JVMs

On 07/10/2015 03:00 PM, 大平怜 wrote:
> Hello,
> 
>> Thanks for the addition to the test for ppc. Does that work for both 32-bit and 64-bit ppc compilation?
> 
> It should work, but I have only a 64-bit little-endian ppc machine,
> which does not support 32-bit binaries.  I don't have access to
> a big-endian ppc machine, which supports both 32 and 64 bits.
> 
>> Attached is a revised version of the patch.  Could you give that a try?
> 
> The revised patch works well with the test case and with the Java application
> in which I originally found this problem.  Thanks!
> 
> 
> Rei Odaira

Hi,

I have tweaked the test a little and checked it into the upstream oprofile-tests git repoository. It seems to work fine on x86-64. I have a rhel7 ppc64 machine setup that should be big endian and give it a try. 

-Will
> 
> 2015-07-10 10:51 GMT-05:00 William Cohen <[email protected] <mailto:[email protected]>>:
> 
>     On 07/10/2015 04:31 AM, Andrew Haley wrote:
>     > On 07/07/15 21:31, William Cohen wrote:
>     >> Sorry, it has taken me a while to get back to this.
>     >>
>     >> I am including Andrew Haley on this email because he works on the JVM
>     >> and has used oprofile to monitor performance of JVM generated code.
>     >> He might be able to give some feedback this issue and whether the
>     >> proposed fix is sufficient.
>     >
>     > It's certainly true that the JVM can split and remap memory areas, so
>     > you have to be able to cope with that.
>     >
>     > Andrew.
>     >
> 
>     Hi Andrew,
> 
>     Thanks for the confirmation that the JVM might do that.  I have reworked the patch based on Rei Odaira's comments.  Andrew, this should address the problem you encountered in mid-May with samples being lost due to no permanent mapping on arm64.  Could you give the scratch built Fedora 22 rpms a try:
> 
>     x86, x86-64, armv7 arm http://koji.fedoraproject.org/koji/taskinfo?taskID=10331313
> 
>     64-bit arm64:  http://arm.koji.fedoraproject.org/koji/taskinfo?taskID=3063105
> 
>     Assuming this patch is good, I would like to roll this patch into the upstream oprofile and make a release candiate.
> 
>     --Will
> 
> 
> 


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