Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting

[Alexander Shishkin]

Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> writes:

> Em Wed, Aug 26, 2015 at 07:56:47PM +0300, Alexander Shishkin escreveu:
>> So I hacked stuff a bit [1] to accomodate some of the above
>> ideas. The below diff shows how these ideas integrate with perf. The
>> rest is in my github tree.
>> 
>>  - this exterr implementation allows its users to add arbitrary
>>  information to the  call site structures and also pretty print them on
>>  the way out; in the example, perf stores perf_event_attr field name
>>  that is the source of trouble; it's a string rather than offsetof(),
>>  because half of our event attribute is a bit field;
>>  - the "way out" doesn't have to be syscall return path (although in the
>>  example it is);
>>  - userspace can fetch the extended error reports via prctl() like you
>>  suggested above;
>>  - error codes are still passed around in the [-EXT_ERRNO..-MAX_ERRNO]
>>  range until they are passed to userspace (which is where ext_err_code()
>>  converts them back to traditional errno.h values).
>
> Hey, can we see the builtin-record.c patch please?

Should be on the way to your inbox.

Cheers,
--
Alex
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