Hello I am trying to adopt PMC for performance works and add some kind of post processing to customized pmcstat(8) output. In order to customize output I use internal plugin interface, and it isn't problem.
What I found is that interface, or any other type of output from pmctsat profiling samples doesn't have kernel and user spaces stacks combined, only one or another. For instance pmcstat -R profile -k /boot/kernel.amd64 > dump_profile.txt Stack traces (just short example) either kernel or user space callchain 0 0x2000616 2 6 s ... 0xffffffff80b49baf ... 0xffffffff80b4b2c2 ... 0xffffffff80b553b3 ... 0xffffffff8071bb2a ... 0xffffffff8071cb58 ... 0xffffffff8066d055 callchain 10059 0x3000616 3 6 u ... 0x801b39304 ... 0x811e46b09 ... 0x811f0c821 ... 0x811e99551 ... 0x801b4e9d5 ... 0x801b55510 callchain 10059 0x2000616 2 5 u ... 0x801b593d1 ... 0x801b4cb4a ... 0x801b53cd1 ... 0x802771cb5 ... 0x7fffda7d3000 callchain 10059 0x3000616 3 23 u ... 0x802cf9fa1 ... 0x801dc0018 ... 0x80fc6392b ... 0x80fc5eabd ... 0x80fc5e44d ... 0x80fcc3f5a ... 0x80fc5e327 ... 0x80fc5d578 ... 0x80fc5ce8c ... 0x80fcc3f5a If kernel execution initiated by user space code than trace started from [kernel:amd64_syscall+0x...] So the questions are - Is it possible to have callstacks combined in pmcstat out of the box, so it would be seen what user space code cause kernel execution? - If not possible out of the box, what kind of post processing or toolchain modification is required? I am running pmcstat of FreeBSD 10 Thanks, Alexander _______________________________________________ freebsd-performance@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscr...@freebsd.org"
