Re: [PATCH RFC 0/3] x86: Intel Processor Trace Logger

[Alexander Shishkin <alexander.shishkin@linux.intel.com>]

Takao Indoh <indou.takao@jp.fujitsu.com> writes:

> Hi all,
>
> This patch creates log buffer for Intel PT and enable logging at boot
> time. When kernel panic occurs, we can get this log buffer from
> crashdump file by kdump, and reconstruct the flow that led to the panic.

Good to see this work going forward!

> Takao Indoh (3):
>   x86: Add Intel PT common files
>   x86: Add Intel PT logger
>   x86: Stop Intel PT and save its registers when panic occurs
>
>  arch/x86/Kconfig                          |   16 ++
>  arch/x86/include/asm/intel_pt.h           |   84 +++++++++
>  arch/x86/kernel/cpu/Makefile              |    3 +
>  arch/x86/kernel/cpu/intel_pt.h            |  131 -------------
>  arch/x86/kernel/cpu/intel_pt_cap.c        |   69 +++++++
>  arch/x86/kernel/cpu/intel_pt_log.c        |  288 +++++++++++++++++++++++++++++
>  arch/x86/kernel/cpu/intel_pt_perf.h       |   78 ++++++++
>  arch/x86/kernel/cpu/perf_event_intel_pt.c |   54 +-----
>  arch/x86/kernel/crash.c                   |    9 +
>  9 files changed, 556 insertions(+), 176 deletions(-)
>  create mode 100644 arch/x86/include/asm/intel_pt.h
>  delete mode 100644 arch/x86/kernel/cpu/intel_pt.h
>  create mode 100644 arch/x86/kernel/cpu/intel_pt_cap.c
>  create mode 100644 arch/x86/kernel/cpu/intel_pt_log.c
>  create mode 100644 arch/x86/kernel/cpu/intel_pt_perf.h

One note here: you want to use -M with git-format-patch so that renames
are handled better.

Regards,
--
Alex