From efb3d17240d80e27508d238809168120fe4b93a4 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 29 May 2009 14:25:58 +0200 Subject: [PATCH] perf_counter: Fix COMM and MMAP events for cpu wide counters Commit a63eaf34ae6 ("perf_counter: Dynamically allocate tasks' perf_counter_context struct") broke COMM and MMAP notification for cpu wide counters by dropping out early if there was no task context, thereby also not iterating the cpu context. Signed-off-by: Peter Zijlstra Cc: Mike Galbraith Cc: Paul Mackerras Cc: Corey Ashford Cc: Marcelo Tosatti Cc: Arnaldo Carvalho de Melo Cc: John Kacur LKML-Reference: Signed-off-by: Ingo Molnar --- kernel/perf_counter.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 616c52426b32..58d6d198faa2 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -2443,9 +2443,9 @@ static void perf_counter_comm_event(struct perf_comm_event *comm_event) cpuctx = &get_cpu_var(perf_cpu_context); perf_counter_comm_ctx(&cpuctx->ctx, comm_event); + if (cpuctx->task_ctx) + perf_counter_comm_ctx(cpuctx->task_ctx, comm_event); put_cpu_var(perf_cpu_context); - - perf_counter_comm_ctx(current->perf_counter_ctxp, comm_event); } void perf_counter_comm(struct task_struct *task) @@ -2454,8 +2454,6 @@ void perf_counter_comm(struct task_struct *task) if (!atomic_read(&nr_comm_tracking)) return; - if (!current->perf_counter_ctxp) - return; comm_event = (struct perf_comm_event){ .task = task, @@ -2570,10 +2568,10 @@ got_name: cpuctx = &get_cpu_var(perf_cpu_context); perf_counter_mmap_ctx(&cpuctx->ctx, mmap_event); + if (cpuctx->task_ctx) + perf_counter_mmap_ctx(cpuctx->task_ctx, mmap_event); put_cpu_var(perf_cpu_context); - perf_counter_mmap_ctx(current->perf_counter_ctxp, mmap_event); - kfree(buf); } @@ -2584,8 +2582,6 @@ void perf_counter_mmap(unsigned long addr, unsigned long len, if (!atomic_read(&nr_mmap_tracking)) return; - if (!current->perf_counter_ctxp) - return; mmap_event = (struct perf_mmap_event){ .file = file, -- 2.39.5