From: Eric Dumazet <eduma...@google.com> Date: Thu, 13 Aug 2020 10:06:43 -0700
> There has been some heat around prandom_u32() lately, and some people > were wondering if there was a simple way to determine how often > it was used, before considering making it maybe 10 times more expensive. > > This tracepoint exports the generated pseudo random value. > > Tested: > > perf list | grep prandom_u32 > random:prandom_u32 [Tracepoint event] > > perf record -a [-g] [-C1] -e random:prandom_u32 sleep 1 > [ perf record: Woken up 0 times to write data ] > [ perf record: Captured and wrote 259.748 MB perf.data (924087 samples) ] > > perf report --nochildren > ... > 97.67% ksoftirqd/1 [kernel.vmlinux] [k] prandom_u32 > | > ---prandom_u32 > prandom_u32 > | > |--48.86%--tcp_v4_syn_recv_sock > | tcp_check_req > | tcp_v4_rcv > | ... > --48.81%--tcp_conn_request > tcp_v4_conn_request > tcp_rcv_state_process > ... > perf script > > Signed-off-by: Eric Dumazet <eduma...@google.com> Applied, thanks Eric.
