From: Adrian Hunter <adrian.hunter@intel.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>, Andi Kleen <ak@linux.intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Joerg Roedel <joro@8bytes.org>, Jiri Olsa <jolsa@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH RFC 07/19] perf tools: Workaround missing maps for x86_64 KPTI entry trampolines
Date: Fri, 11 May 2018 14:15:53 +0300 [thread overview]
Message-ID: <b34d2556-10d1-4de9-caa6-700dd850d8e5@intel.com> (raw)
In-Reply-To: <20180510201542.GD4311@kernel.org>
On 10/05/18 23:15, Arnaldo Carvalho de Melo wrote:
> Em Thu, May 10, 2018 at 07:08:37PM +0000, Hunter, Adrian escreveu:
>>> -----Original Message-----
>>> From: Arnaldo Carvalho de Melo [mailto:acme@kernel.org]
>>> Sent: Wednesday, May 9, 2018 8:07 PM
>>> To: Hunter, Adrian <adrian.hunter@intel.com>
>>> Cc: Thomas Gleixner <tglx@linutronix.de>; Ingo Molnar
>>> <mingo@redhat.com>; Peter Zijlstra <peterz@infradead.org>; Andy
>>> Lutomirski <luto@kernel.org>; H. Peter Anvin <hpa@zytor.com>; Andi Kleen
>>> <ak@linux.intel.com>; Alexander Shishkin
>>> <alexander.shishkin@linux.intel.com>; Dave Hansen
>>> <dave.hansen@linux.intel.com>; Joerg Roedel <joro@8bytes.org>; Jiri Olsa
>>> <jolsa@redhat.com>; linux-kernel@vger.kernel.org; x86@kernel.org
>>> Subject: Re: [PATCH RFC 07/19] perf tools: Workaround missing maps for
>>> x86_64 KPTI entry trampolines
>>>
>>> Em Wed, May 09, 2018 at 02:43:36PM +0300, Adrian Hunter escreveu:
>>>> On x86_64 the KPTI entry trampolines are not in the kernel map created
>>>> by perf tools. That results in the addresses having no symbols and
>>>> prevents annotation. It also causes Intel PT to have decoding errors
>>>> at the trampoline addresses. Workaround that by creating maps for the
>>> trampolines.
>>>> At present the kernel does not export information revealing where the
>>>> trampolines are. Until that happens, the addresses are hardcoded.
>>>>
>>>> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
>>>> ---
>>>> tools/perf/util/machine.c | 104
>>> ++++++++++++++++++++++++++++++++++++++++++++++
>>>> tools/perf/util/machine.h | 3 ++
>>>> tools/perf/util/symbol.c | 12 +++---
>>>> 3 files changed, 114 insertions(+), 5 deletions(-)
>>>>
>>>> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
>>>> index 22047ff3cf2a..1bf15aa0b099 100644
>>>> --- a/tools/perf/util/machine.c
>>>> +++ b/tools/perf/util/machine.c
>>>> @@ -851,6 +851,110 @@ static int
>>> machine__get_running_kernel_start(struct machine *machine,
>>>> return 0;
>>>> }
>>>>
>>>> +struct special_kernal_map {
>>>
>>> s/kernal/kernel/
>>>
>>> And "special"?
>>
>> I have added comment:
>>
>> /* Kernel-space maps that are not the main kernel map nor a module map */
>
> Perhaps:
>
> /* Kernel-space maps for symbols that are outside the main kernel map and module maps */
>
> struct extra_kernel_map;
>
> What do you think?
I have done the re-naming and comment change and pushed the changes to the
same branch.
next prev parent reply other threads:[~2018-05-11 11:17 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-09 11:43 [PATCH RFC 00/19] perf tools and x86_64 KPTI entry trampolines Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 01/19] kallsyms: Simplify update_iter_mod() Adrian Hunter
2018-05-10 13:01 ` Jiri Olsa
2018-05-10 17:02 ` Hunter, Adrian
2018-05-14 17:55 ` Arnaldo Carvalho de Melo
2018-05-09 11:43 ` [PATCH RFC 02/19] kallsyms, x86: Export addresses of syscall trampolines Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 03/19] x86: Add entry trampolines to kcore Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 04/19] x86: kcore: Give entry trampolines all the same offset in kcore Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 05/19] perf tools: Use the _stest symbol to identify the kernel map when loading kcore Adrian Hunter
2018-05-16 18:04 ` [tip:perf/core] perf tools: Use the "_stest" " tip-bot for Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 06/19] perf tools: Fix kernel_start for KPTI on x86_64 Adrian Hunter
2018-05-09 17:08 ` Arnaldo Carvalho de Melo
2018-05-09 11:43 ` [PATCH RFC 07/19] perf tools: Workaround missing maps for x86_64 KPTI entry trampolines Adrian Hunter
2018-05-09 17:07 ` Arnaldo Carvalho de Melo
2018-05-10 19:08 ` Hunter, Adrian
2018-05-10 20:15 ` Arnaldo Carvalho de Melo
2018-05-10 20:19 ` Arnaldo Carvalho de Melo
2018-05-10 20:47 ` Arnaldo Carvalho de Melo
2018-05-11 11:18 ` Adrian Hunter
2018-05-11 14:45 ` Arnaldo Carvalho de Melo
2018-05-14 13:02 ` Adrian Hunter
2018-05-11 11:15 ` Adrian Hunter [this message]
2018-05-15 10:30 ` Jiri Olsa
2018-05-15 10:40 ` Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 08/19] perf tools: Fix map_groups__split_kallsyms() for entry trampoline symbols Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 09/19] perf tools: Allow for special kernel maps Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 10/19] perf tools: Create maps for x86_64 KPTI entry trampolines Adrian Hunter
2018-05-14 8:32 ` Ingo Molnar
2018-05-09 11:43 ` [PATCH RFC 11/19] perf tools: Synthesize and process mmap events " Adrian Hunter
2018-05-15 10:49 ` Jiri Olsa
2018-05-09 11:43 ` [PATCH RFC 12/19] perf buildid-cache: kcore_copy: Keep phdr data in a list Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 13/19] perf buildid-cache: kcore_copy: Keep a count of phdrs Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 14/19] perf buildid-cache: kcore_copy: Calculate offset from phnum Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 15/19] perf buildid-cache: kcore_copy: Layout sections Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 16/19] perf buildid-cache: kcore_copy: Iterate phdrs Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 17/19] perf buildid-cache: kcore_copy: Get rid of kernel_map Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 18/19] perf buildid-cache: kcore_copy: Copy x86_64 entry trampoline sections Adrian Hunter
2018-05-09 11:43 ` [PATCH RFC 19/19] perf buildid-cache: kcore_copy: Amend the offset of sections that remap kernel text Adrian Hunter
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