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SubjectRe: [RFC GIT PULL] x86 entry / perf stacktrace changes

* Frederic Weisbecker <fweisbec@gmail.com> wrote:

> Ingo,
>
> Please pull the perf/stacktrace branch that can be found at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git
> perf/stacktrace
>
> Or may be not yet. It's still in RFC because I would like
> to ensure I did not break cfi annotations. I hope Jan beulich
> or others can have a look.
>
> Sorry to mess up irq entry and perf stacktrace changes in the same
> topic. But the changes happen to be very interconnected.
>
> Several cleanups, fixes and optimizations for the x86-64
> stacktraces and irq entry.
>
> Last patch seems to add a bit of overhead in the irq entry
> (one more "push") but given the changes made in previous
> patches, the end result is a more optimized and more clear irq
> entry.
>
> Thanks,
> Frederic
> ---
>
> Frederic Weisbecker (6):
> x86: Save stack pointer in perf live regs savings
> x86: Fetch stack from regs when possible in dump_trace()
> x86,64: Simplify save_regs()
> x86,64: Separate arg1 from rbp handling in SAVE_REGS_IRQ
> x86: Remove useless unwinder backlink from irq regs saving
> x86: Don't use frame pointer to save old stack on irq entry
>
>
> arch/x86/include/asm/perf_event.h | 5 +++
> arch/x86/kernel/dumpstack_64.c | 37 +++-----------------
> arch/x86/kernel/entry_64.S | 69 ++++++++++++++++--------------------
> 3 files changed, 41 insertions(+), 70 deletions(-)

Pulled, thanks a lot Frederic! The irq backtrace fixes look pretty
important - if there's any CFI annotation detail to be fixed we can
do it in a delta.

Thanks,

Ingo


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