diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2013-10-16 22:09:45 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-29 12:02:51 +0100 |
| commit | 32c5fb7e7d18b4fd37c5e29dea731151e9d66866 (patch) | |
| tree | 1e61c95eb304fd493684138baf791517aa7dfed5 /kernel/events | |
| parent | d9494cb4299da66541a3f3ab82c552889bee0606 (diff) | |
| download | linux-32c5fb7e7d18b4fd37c5e29dea731151e9d66866.tar.gz linux-32c5fb7e7d18b4fd37c5e29dea731151e9d66866.tar.xz | |
perf: Kill the dead !vma->vm_mm code in perf_event_mmap_event()
1. perf_event_mmap(vma) is never called with a gate_vma-like arg,
remove the "if (!vma->vm_mm)" code.
2. arch_vma_name() can use the chached value of mmap_event->vma.
3. Change the code to not call arch_vma_name() twice.
4. Purely cosmetic, but since we use "goto got_name" all the time
remove "else" from "[stack]" branch just for symmetry.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20131016200945.GB23214@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/core.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 028dad97760d..3ea560551a2a 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5136,21 +5136,19 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event) min = MINOR(dev); } else { - if (arch_vma_name(mmap_event->vma)) { - name = strncpy(tmp, arch_vma_name(mmap_event->vma), - sizeof(tmp) - 1); + name = arch_vma_name(vma); + if (name) { + name = strncpy(tmp, name, sizeof(tmp) - 1); tmp[sizeof(tmp) - 1] = '\0'; goto got_name; } - if (!vma->vm_mm) { - name = strncpy(tmp, "[vdso]", sizeof(tmp)); - goto got_name; - } else if (vma->vm_start <= vma->vm_mm->start_brk && + if (vma->vm_start <= vma->vm_mm->start_brk && vma->vm_end >= vma->vm_mm->brk) { name = strncpy(tmp, "[heap]", sizeof(tmp)); goto got_name; - } else if (vma->vm_start <= vma->vm_mm->start_stack && + } + if (vma->vm_start <= vma->vm_mm->start_stack && vma->vm_end >= vma->vm_mm->start_stack) { name = strncpy(tmp, "[stack]", sizeof(tmp)); goto got_name; |