[ubuntu 16.10] Enable perf to probe and record on SDT events present in binaries

[bugproxy]

This is a feature request for 16.10:

SDT events are markers placed at important places in the binaries. When they are probed and traced, they can give valuable information about the userspace application. This feature aims to enable perf to probe/record on SDT events.

Patches are being currently sent :
https://lkml.org/lkml/2016/5/14/107 patchset for probe-cache and initial SDT support
https://lkml.org/lkml/2016/5/3/810 patch to directly record on SDT events.

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2016-07-22 12:48 EDT-------
Patches for this feature are upstream now (in tip). This was accepted over multiple patchsets. Here is a list of commits which enable this feature :
These commits are in "master" branch of kernel "tip" tree.

e5dc848356ecf6ea8d27d641c4d7ad8d42fe92b "perf test: Add a test case for SDT event"
e26e63be64a108c1fd12020b93b5b447ffe0532b "perf build: Add sdt feature detection"
7e9fca51fbf8430e27fb6b29299eda575e3f00cf "perf probe: Support a special SDT probe format"
a598180aa1279bac4d24dfc85cd2d78553c4210d "perf probe: Support @BUILDID or @FILE suffix for SDT events"
40218daea1db1f95f1f10e58ebd43b8adf1c6c61 "perf list: Show SDT and pre-cached events"
1de7b8bf728fd8d51b0cc644003d0694c6e0feef "perf probe: Search SDT/cached event from all probe caches"
42bba263eb58800b6239a0cb35ac17fd29379277 "perf probe: Allow wildcard for cached events"
05bf2c8a2a819132b4a8f35d4315ff22e8e84a20 "perf probe-cache: Add for_each_probe_cache_entry() wrapper"
c3492a3a4e58117f18d96125e67b0bed7c4231e1 "perf probe: Make --list show only available cached events"
36a009fe07bdecd201335f982babb8af34b603e2 "perf probe: Accept %sdt and %cached event name"
1c1a3a4729aae712c55e001e151ef008d030d4a7 "perf tools: Add feature detection for gelf_getnote()"
6430a94ead2a4c8f350441351a735303eb6d1c8a "perf buildid-cache: Scan and import user SDT events to probe cache"
8d993d96901f55d26e083390aae80fd02cbff7aa "perf probe: Add group name support"
060fa0c7a3e0bb4f1426ee79dfd38e2a4c80067a "perf sdt: ELF support for SDT"
2492c465ad3ae6860ebfff1c9032865017835e70 "perf build: Add feature detection for libelf's elf_getshdrstrndx()"

Thanks,
Hemant

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2016-08-02 11:57 EDT-------
Canonical - any outlook here for including the patchset in daily build?

[Tim Gardner (timg-tpi)]

All of the commits mentioned in #1 have been merged upstream and will be present in 4.8-rc1. v4.8 is the target kernel for Ubuntu 16.10. As such, I believe no further work is required for this feature. The mainline daily builds for v4.8 should appear soon after v4.8-rc1 is released.

[Tim Gardner (timg-tpi)]

Merged in v4.8