Re: [PATCH v9 2/3]: perf record: enable asynchronous trace writing

[Alexey Budankov]

Hi,
On 05.10.2018 14:50, Alexey Budankov wrote:<SNIP>
> 
> According to docs [1] ftruncate() does not advance file pos 
> which is essential here.
> 

Ideally, the both lseek() syscalls in every loop iteration can be
replaced by the only two syscalls just before and after the loop and
advancing *in-flight* off file pos value at perf_mmap__aio_push() 
after every successful record__aio_pushfn().

Thanks,
Alexey