* Alexey Budankov <alexey.budan...@linux.intel.com> wrote:
> It may sound too optimistic but glibc API is expected to be backward > compatible > and for POSIX AIO API part too. Internal implementation also tends to evolve > to > better option overtime, more probably basing on modern kernel capabilities > mentioned here: http://man7.org/linux/man-pages/man2/io_submit.2.html I'm not talking about compatibility, and I'm not just talking about glibc, perf works under other libcs as well - and let me phrase it in another way: basic event handling, threading, scheduling internals should be a *core competency* of a tracing/profiling tool. I.e. we might end up using the exact same per event fd thread pool design that glibc uses currently. Or not. Having that internal and open coded to perf, like Jiri has started implementing it, allows people to experiment with it. This isn't some GUI toolkit, this is at the essence of perf, and we are not very good on large systems right now, and I think the design should be open-coded threading, not relying on an (perf-)external AIO library to get it right. The glibc thread pool implementation of POSIX AIO is basically a fall-back implementation, for the case where there's no native KAIO interface to rely on. > Well, explicit threading in the tool for AIO, in the simplest case, means > incorporating some POSIX API implementation into the tool, avoiding > code reuse in the first place. That tends to be error prone and costly. It's a core competency, we better do it right and not outsource it. Please take a look at Jiri's patches (once he re-posts them), I think it's a very good starting point. Thanks, Ingo
