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authorOleg Nesterov <oleg@redhat.com>2013-10-16 22:09:45 +0200
committerIngo Molnar <mingo@kernel.org>2013-10-29 12:02:51 +0100
commit32c5fb7e7d18b4fd37c5e29dea731151e9d66866 (patch)
tree1e61c95eb304fd493684138baf791517aa7dfed5 /kernel/events
parentd9494cb4299da66541a3f3ab82c552889bee0606 (diff)
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.c14
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;