Hi Andi, On Mon, Oct 23, 2023 at 2:58 PM Andi Kleen <ak@xxxxxxxxxxxxxxx> wrote: > > Namhyung Kim <namhyung@xxxxxxxxxx> writes: > > > Hello, > > > > I'm happy to share my work on data type profiling. This is to associate > > PMU samples to data types they refer using DWARF debug information. So > > basically it depends on quality of PMU events and compiler for producing > > DWARF info. But it doesn't require any changes in the target program. > > > > As it's an early stage, I've targeted the kernel on x86 to reduce the > > amount of work but IIUC there's no fundamental blocker to apply it to > > other architectures and applications. > > FWIW i posted a similar patchkit a long time ago > > https://lore.kernel.org/lkml/20171128002321.2878-13-andi@xxxxxxxxxxxxxx/ > > It was on my list to resurrect that, it's great that you are doing > something similar. > > The latest iteration (not posted) was here: > > https://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git/log/?h=perf/var-resolve-7 Oh, I wasn't aware of this series. I'll take a look. > > The main difference seems to be that mine was more for perf script > (e.g. i supported PT decoding), while you are more focused on sampling. > I relied on the kprobes/uprobes engine, which unfortunately was always > quite slow and had many limitations. Right, I think dealing with regular samples would be more useful. But Intel PT support looks interesting. > > Perhaps it would be possible merge the useful parts of the two approaches? Sounds good! Thanks for your comment! Namhyung
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