Date: Tue, 29 Jul 2014 19:23:42 -0400 From: Mark Johnston <markj@freebsd.org> To: Adrian Chadd <adrian@freebsd.org> Cc: "dtrace@freebsd.org" <dtrace@freebsd.org> Subject: Re: dtrace pid provider on entry == segfault process Message-ID: <CAMw1wOw-f%2BLqCRKF01afZmEbSBz0gzW3GHgMZckHerwnGLwndw@mail.gmail.com> In-Reply-To: <CAJ-VmomxquPcf%2BaiXQTCZc=bq%2B_9-YNbAF2=bY-CmxPmmMZa=A@mail.gmail.com> References: <CAJ-VmokzVDXPTb5r=BOOxioAEdckYUst58X%2BHCaVf_o00gHNmQ@mail.gmail.com> <CAJ-Vmok8VXSmOSMw5skG8RnC86_v19tNjA9x9ctjhdynDJv5Sg@mail.gmail.com> <CAMw1wOwB-Gk=5RdgR=g2uXZk5VwdUBObkaSKNuftF=VQyibYEQ@mail.gmail.com> <CAJ-VmokF-ne32omR_csKZuet8m9U8ez6jsv=jDNE-0ns=7tPuQ@mail.gmail.com> <CAJ-VmomxquPcf%2BaiXQTCZc=bq%2B_9-YNbAF2=bY-CmxPmmMZa=A@mail.gmail.com>
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On Tue, Jul 29, 2014 at 7:19 PM, Adrian Chadd <adrian@freebsd.org> wrote:
> ... whilst I'm here, is this supposed to work?
It might not crash, but I wouldn't expect it to work properly (on
amd64 at least) without the change I mentioned.
>
> [root@darkwatch] /data/blockd# dtrace -s test2.d -p 28686
>
> dtrace: script 'test2.d' matched 1 probe
>
> ^C
>
>
> blockd
>
> value ------------- Distribution ------------- count
>
> -1 | 0
>
> 0 | 4676
>
> 1 |@ 23715
>
> 2 | 7642
>
> 4 | 9457
>
> 8 |@ 32601
>
> 16 | 17893
>
> 32 | 8685
>
> 64 | 1102
>
> 128 | 1315
>
> 256 | 0
>
> 512 | 0
>
> 1024 | 0
>
> 2048 | 0
>
> 4096 | 0
>
> 8192 | 0
>
> 16384 | 0
>
> 32768 | 0
>
> 65536 | 0
>
> 131072 | 0
>
> 262144 | 0
>
> 524288 | 0
>
> 1048576 | 0
>
> 2097152 | 0
>
> 4194304 | 0
>
> 8388608 | 0
>
> 16777216 | 0
>
> 33554432 | 0
>
> 67108864 | 0
>
> 134217728 | 0
>
> 268435456 | 0
>
> 536870912 | 0
>
> 1073741824 | 0
>
> 2147483648 | 0
>
> 4294967296 | 0
>
> 8589934592 | 0
>
> 17179869184 | 0
>
> 34359738368 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1335242
>
> 68719476736 | 0
>
> 137438953472 | 0
>
> 274877906944 | 0
>
> 549755813888 | 0
>
> 1099511627776 | 0
>
> 2199023255552 | 0
>
> 4398046511104 | 0
>
> 8796093022208 | 0
>
> 17592186044416 | 0
>
> 35184372088832 | 0
>
> 70368744177664 | 2630
>
> 140737488355328 | 0
>
>
> [root@darkwatch] /data/blockd# cat test2.d
>
> pid$target:libc*:memcpy:return
>
> {
>
> @[execname] = quantize(arg2);
>
> }
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