linux-kernel - Re: [PATCHv3 0/8] hw_breakpoint: Breakpoint modification fixes and new modify ioctl

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Date:   Tue, 13 Mar 2018 07:37:47 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Milind Chabbi <chabbi.milind@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Hari Bathini <hbathini@...ux.vnet.ibm.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
        Oleg Nesterov <onestero@...hat.com>,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCHv3 0/8] hw_breakpoint: Breakpoint modification fixes and
 new modify ioctl


* Jiri Olsa <jolsa@...nel.org> wrote:

> Jiri Olsa (7):
>       hw_breakpoint: Pass bp_type directly as find_slot_idx argument
>       hw_breakpoint: Pass bp_type argument to __reserve_bp_slot|__release_bp_slot
>       hw_breakpoint: Add modify_bp_slot function
>       hw_breakpoint: Factor out __modify_user_hw_breakpoint function
>       hw_breakpoint: Add perf_event_attr fields check in __modify_user_hw_breakpoint
>       perf/core: Move perf_event_attr::sample_max_stack into perf_copy_attr
>       perf tests: Add breakpoint accounting/modify test
> 
> Milind Chabbi (1):
>       perf/core: fast breakpoint modification via _IOC_MODIFY_ATTRIBUTES.
> 
>  include/linux/hw_breakpoint.h         |   7 +++++
>  include/uapi/linux/perf_event.h       |  23 ++++++++-------
>  kernel/events/core.c                  |  54 ++++++++++++++++++++++++++++++++--
>  kernel/events/hw_breakpoint.c         | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++---------------------
>  tools/include/uapi/linux/perf_event.h |  23 ++++++++-------
>  tools/perf/tests/Build                |   1 +
>  tools/perf/tests/bp_account.c         | 195 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  tools/perf/tests/builtin-test.c       |   4 +++
>  tools/perf/tests/tests.h              |   1 +
>  9 files changed, 365 insertions(+), 58 deletions(-)
>  create mode 100644 tools/perf/tests/bp_account.c

Note, there's a new PARISC build failure:

 home/mingo/tip/kernel/events/core.c:2858:2: error: implicit declaration of function 'modify_user_hw_breakpoint_check' [-Werror=implicit-function-declaration]
   err = modify_user_hw_breakpoint_check(bp, attr, true);

will only be able to push it out to -next once this is fixed.

Thanks,

	Ingo