From: Namhyung Kim <namhyung@kernel.org>
To: Kim Phillips <kim.phillips@arm.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
Jiri Olsa <jolsa@redhat.com>, Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Jiri Olsa <jolsa@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
kernel-team@lge.com
Subject: Re: [PATCH] perf tools: set kernel end address properly
Date: Thu, 19 Apr 2018 11:54:24 +0900 [thread overview]
Message-ID: <20180419025424.GC13370@sejong> (raw)
In-Reply-To: <20180418193759.b63912fe5e5b8a9023ec80a8@arm.com>
On Wed, Apr 18, 2018 at 07:37:59PM -0500, Kim Phillips wrote:
> diff --git a/tools/perf/arch/arm64/util/sym-handling.c b/tools/perf/arch/arm64/util/sym-handling.c
> index 0051b1ee8450..5c4a2e208bbc 100644
> --- a/tools/perf/arch/arm64/util/sym-handling.c
> +++ b/tools/perf/arch/arm64/util/sym-handling.c
> @@ -20,3 +20,16 @@ bool elf__needs_adjust_symbols(GElf_Ehdr ehdr)
> ehdr.e_type == ET_DYN;
> }
> #endif
> +
> +const char *arch__normalize_symbol_name(const char *name)
> +{
> + /*
> + * arm64 kernels compensating for a CPU erratum can put up a
> + * module_emit_adrp_veneer in place of a module_emit_plt_entry
> + */
> + if (name && strlen(name) >= 23 &&
> + !strncmp(name, "module_emit_adrp_veneer", 23))
> + return "module_emit_plt_entry";
> +
> + return name;
> +}
I don't know it's always preferable or just for the test. It it's the
latter it may be better to move it to the test code.
> diff --git a/tools/perf/tests/vmlinux-kallsyms.c b/tools/perf/tests/vmlinux-kallsyms.c
> index 1e5adb65632a..07064e76947d 100644
> --- a/tools/perf/tests/vmlinux-kallsyms.c
> +++ b/tools/perf/tests/vmlinux-kallsyms.c
> @@ -163,6 +163,29 @@ int test__vmlinux_matches_kallsyms(struct test *test __maybe_unused, int subtest
>
> continue;
> }
> + } else if (pair) {
> + s64 skew = mem_start - UM(pair->start);
> + struct map *kmap = map_groups__find(&kallsyms.kmaps, type, mem_start);
> + struct map *vmap = map_groups__find(&vmlinux.kmaps, type, mem_start);
> +
> + /*
> + * arm64 kernels compensating for a CPU erratum can put up a
> + * module_emit_adrp_veneer in place of a module_emit_plt_entry
> + */
> + if (llabs(skew) < page_size)
It seems that we needs to check it's the ARM64 at least. If it's a
rare case we might need to add more paranoid checks.
Thanks,
Namhyung
> + {
> + pr_debug("NO ERR FOR SKEW %ld: %#" PRIx64 ": diff start addr v: %s k: %#" PRIx64 " %s\n",
> + skew, mem_start, sym->name, UM(pair->start), pair->name);
> + continue;
> + }
> +
> + pr_debug("ERR : %#" PRIx64 ": diff start addr v: %s k: %#" PRIx64 " %s\n",
> + mem_start, sym->name, UM(pair->start), pair->name);
> +
> + if (kmap && vmap) {
> + pr_debug(" : map v: %s k: %s\n",
> + vmap->dso->short_name, kmap->dso->short_name);
> + }
> } else
> pr_debug("ERR : %#" PRIx64 ": %s not on kallsyms\n",
> mem_start, sym->name);
next prev parent reply other threads:[~2018-04-19 2:54 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-16 4:22 [PATCH] perf tools: set kernel end address properly Namhyung Kim
2018-04-16 9:23 ` Jiri Olsa
2018-04-16 13:51 ` Arnaldo Carvalho de Melo
2018-04-16 16:07 ` Kim Phillips
2018-04-16 16:58 ` Arnaldo Carvalho de Melo
2018-04-16 17:24 ` Kim Phillips
2018-04-16 22:48 ` Kim Phillips
2018-04-17 2:27 ` Namhyung Kim
2018-04-19 0:37 ` Kim Phillips
2018-04-19 2:37 ` Namhyung Kim
2018-04-19 23:20 ` Kim Phillips
2018-04-19 23:59 ` Namhyung Kim
2018-04-20 23:23 ` Kim Phillips
2018-04-23 13:52 ` Arnaldo Carvalho de Melo
2018-04-23 14:56 ` Kim Phillips
2018-04-26 5:51 ` [tip:perf/urgent] perf machine: Set main " tip-bot for Namhyung Kim
2018-04-19 2:54 ` Namhyung Kim [this message]
2018-04-19 23:33 ` [PATCH] perf tools: set " Kim Phillips
2018-04-20 0:11 ` Namhyung Kim
2018-04-20 8:10 ` Ard Biesheuvel
2018-04-23 21:43 ` Kim Phillips
2018-04-24 6:13 ` Ard Biesheuvel
2018-04-24 12:50 ` Kim Phillips
2018-04-24 13:07 ` Ard Biesheuvel
2018-04-24 15:13 ` [PATCH] arm64/kernel: rename module_emit_adrp_veneer->module_emit_veneer_for_adrp Kim Phillips
2018-04-24 15:15 ` Ard Biesheuvel
2018-04-24 15:39 ` [PATCH v2] " Kim Phillips
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