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SubjectRe: [PATCH 2/3] perf tests: Add dwarf unwind test on ARM
On Wed, May 07, 2014 at 02:24:53PM +0200, Jean Pihet wrote:
> Hi Jiri,
>
> On 7 May 2014 14:06, Jiri Olsa <jolsa@redhat.com> wrote:
> > On Tue, May 06, 2014 at 05:26:18PM +0200, Jean Pihet wrote:
> >
> SNIP
> >
> > there's a memory leak of 'buf' already fixed fox x86:
> >
> > perf tests x86: Fix memory leak in sample_ustack()
> > commit 763d7f5f2718f085bab5a9e63308349728f3ad12
> > Author: Masanari Iida <standby24x7@gmail.com>
> > Date: Sun Apr 20 00:16:41 2014 +0900
> >
> > jirka
>
> Ok
>
> Here is the diff between the x86 and the ARM implementations:
> $ diff -urN tools/perf/arch/arm64/tests/dwarf-unwind.c
> tools/perf/arch/x86/tests/dwarf-unwind.c
> --- tools/perf/arch/arm64/tests/dwarf-unwind.c 2014-05-06
> 17:31:17.507961045 +0200
> +++ tools/perf/arch/x86/tests/dwarf-unwind.c 2014-05-06
> 16:52:00.589776839 +0200
> @@ -21,11 +21,12 @@
> return -1;
> }
>
> - sp = (unsigned long) regs[PERF_REG_ARM64_SP];
> + sp = (unsigned long) regs[PERF_REG_X86_SP];
>
> - map = map_groups__find(&thread->mg, MAP__FUNCTION, (u64) sp);
> + map = map_groups__find(thread->mg, MAP__VARIABLE, (u64) sp);
> if (!map) {
> pr_debug("failed to get stack map\n");
> + free(buf);
> return -1;
> }
>
> Which leads to a few questions:
> - the map_groups__find parameters need to be fixed too, right?

the reason for this is following commit:
6392b4e perf x86: Fix perf to use non-executable stack, again

which also adds global link flags: -Wl,-z,noexecstack
so I'm guessing arm is affected too

> - the free(buf) needs to be fixed,
> - given that the remaining difference in the file is just a register
> macro, it is worth to factor the code in a single file. Does that make
> sense? If worthwhile I can do that once the ARM and ARM64 support is
> merged in.

we can do the code factoring later here, np

thanks,
jirka


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