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

2013-12-08 Thread Masami Hiramatsu
(2013/12/08 1:21), Jovi Zhangwei wrote: > On Sat, Dec 7, 2013 at 7:58 AM, Masami Hiramatsu > wrote: >> (2013/12/06 14:19), Jovi Zhangwei wrote: >>> Hi Alexei, >>> >>> On Thu, Dec 5, 2013 at 12:40 PM, Alexei Starovoitov >>> wrote: > On Tue, Dec 3, 2013 at 4:01 PM, Andi Kleen wrote: >> >>

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

2013-12-07 Thread Jovi Zhangwei
On Sat, Dec 7, 2013 at 7:58 AM, Masami Hiramatsu wrote: > (2013/12/06 14:19), Jovi Zhangwei wrote: >> Hi Alexei, >> >> On Thu, Dec 5, 2013 at 12:40 PM, Alexei Starovoitov >> wrote: On Tue, Dec 3, 2013 at 4:01 PM, Andi Kleen wrote: > > Can you do some performance comparison compared

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

2013-12-06 Thread Alexei Starovoitov
On Fri, Dec 6, 2013 at 3:54 PM, Masami Hiramatsu wrote: > (2013/12/06 14:16), Alexei Starovoitov wrote: >> On Thu, Dec 5, 2013 at 5:20 PM, Andi Kleen wrote: the difference is bigger now: 484-145 vs 185-145 >>> >>> This is a obvious improvement, but imho not big enough to be extremely >>> com

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

2013-12-06 Thread Masami Hiramatsu
(2013/12/06 14:19), Jovi Zhangwei wrote: > Hi Alexei, > > On Thu, Dec 5, 2013 at 12:40 PM, Alexei Starovoitov wrote: >>> On Tue, Dec 3, 2013 at 4:01 PM, Andi Kleen wrote: Can you do some performance comparison compared to e.g. ktap? How much faster is it? >> >> Did simple ktap tes

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

2013-12-06 Thread Masami Hiramatsu
(2013/12/06 14:16), Alexei Starovoitov wrote: > On Thu, Dec 5, 2013 at 5:20 PM, Andi Kleen wrote: >>> the difference is bigger now: 484-145 vs 185-145 >> >> This is a obvious improvement, but imho not big enough to be extremely >> compelling (< cost 1-2 cache misses, no orders of magnitude improve