7 Dec
2015
7 Dec
'15
9:25 a.m.
On 07 Dec 2015, at 09:12, Harald Welte
<laforge(a)gnumonks.org> wrote:
Hi all,
* vfprintf() and friends, from logp() statements. The sad part is that
calls like gsm_lchan_name() are of course executed beefore the call
into logp(), at which point the vfprintf/sprintf/... for arguments has
already been executed, and only the last/final one hasn't happened
yet.
Jacob has proposed (and I think maybe included) a patch to check if
logging is enabled for any target before making the call (and passing
the arguments)
After a brief look at osmo-pcu profiling, it looks
like in the
attached picture. We cannot do much about the __copy_to_user_std,
do_select and core_sys_select, as those are kernel side.
epoll. We avoid transferring FD set to the kernel all the time (and arming
them in the driver). But I assume the bigger cost of to user is the indications
we copy from the DSP to userspace.