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| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2025-08-20 14:03:43 -0400 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-08-26 09:51:13 +0200 |
| commit | 16ed389227651330879e17bd83d43bd234006722 (patch) | |
| tree | 227860a8684309da8d99a7ffb5f44082ca68b34e /kernel | |
| parent | perf: Simplify get_perf_callchain() user logic (diff) | |
| download | linux-16ed389227651330879e17bd83d43bd234006722.tar.gz linux-16ed389227651330879e17bd83d43bd234006722.zip | |
perf: Skip user unwind if the task is a kernel thread
If the task is not a user thread, there's no user stack to unwind.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250820180428.930791978@kernel.org
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/core.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index f880cec0c980..28de3baff792 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -8198,7 +8198,8 @@ struct perf_callchain_entry * perf_callchain(struct perf_event *event, struct pt_regs *regs) { bool kernel = !event->attr.exclude_callchain_kernel; - bool user = !event->attr.exclude_callchain_user; + bool user = !event->attr.exclude_callchain_user && + !(current->flags & (PF_KTHREAD | PF_USER_WORKER)); /* Disallow cross-task user callchains. */ bool crosstask = event->ctx->task && event->ctx->task != current; const u32 max_stack = event->attr.sample_max_stack; |