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 <o...@redhat.com>
---
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 cb4238e..e27d8f8 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5130,21 +5130,19 @@ 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;
--
1.5.5.1
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