path: root/net/packet/af_packet.c
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authorEric Dumazet <>2020-08-13 10:06:43 -0700
committerDavid S. Miller <>2020-08-13 15:11:14 -0700
commit94c7eb54c4b8e81618ec79f414fe1ca5767f9720 (patch)
tree448b3fe1a37f74eb9308781e1957e557d18afb3d /net/packet/af_packet.c
parent9643609423c7667fb748cc3ccff023d761d0ac90 (diff)
random32: add a tracepoint for prandom_u32()
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 (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 <> Cc: Willy Tarreau <> Cc: Sedat Dilek <> Tested-by: Sedat Dilek <> Signed-off-by: David S. Miller <>
Diffstat (limited to 'net/packet/af_packet.c')
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