Re: [RFC PATCH tip 0/5] tracing filters with BPF

[Frank Ch. Eigler]

ast wrote:

>>[...]
> Did simple ktap test with 1M alloc_skb/kfree_skb toy test from earlier email:
> trace skb:kfree_skb {
>         if (arg2 == 0x100) {
>                 printf("%x %x\n", arg1, arg2)
>         }
> }
> [...]

For reference, you might try putting systemtap into the performance
comparison matrix too:

# stap -e 'probe kernel.trace("kfree_skb") { 
              if ($location == 0x100 /* || $location == 0x200 etc. */ ) {
                 printf("%x %x\n", $skb, $location)
              }
           }'


- FChE
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