diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2024-07-04 19:03:38 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2024-07-09 13:26:35 +0200 |
| commit | 5af42f928f3ac555c228740fb4a92d05b19fdd49 (patch) | |
| tree | ebce35c0bd10a125e88d6cc74b8bfe10fa86e1cd /kernel/events | |
| parent | c5d93d23a26012a98b77f9e354ab9b3afd420059 (diff) | |
perf: Shrink the size of the recursion counter.
There are four recursion counter, one for each context. The type of the
counter is `int' but the counter is used as `bool' since it is only
incremented if zero.
The main goal here is to shrink the whole struct into 32bit int which
can later be added task_struct into an existing hole.
Reduce the type of the recursion counter to an unsigned char, keep the
increment/ decrement operation.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Marco Elver <elver@google.com>
Link: https://lore.kernel.org/r/20240704170424.1466941-5-bigeasy@linutronix.de
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/callchain.c | 2 | ||||
| -rw-r--r-- | kernel/events/core.c | 2 | ||||
| -rw-r--r-- | kernel/events/internal.h | 4 |
3 files changed, 4 insertions, 4 deletions
diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c index 1273be84392c..ad57944b6c40 100644 --- a/kernel/events/callchain.c +++ b/kernel/events/callchain.c @@ -29,7 +29,7 @@ static inline size_t perf_callchain_entry__sizeof(void) sysctl_perf_event_max_contexts_per_stack)); } -static DEFINE_PER_CPU(int, callchain_recursion[PERF_NR_CONTEXTS]); +static DEFINE_PER_CPU(u8, callchain_recursion[PERF_NR_CONTEXTS]); static atomic_t nr_callchain_events; static DEFINE_MUTEX(callchain_mutex); static struct callchain_cpus_entries *callchain_cpus_entries; diff --git a/kernel/events/core.c b/kernel/events/core.c index 73e1b02b1c18..53e2750bf720 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -9765,7 +9765,7 @@ struct swevent_htable { int hlist_refcount; /* Recursion avoidance in each contexts */ - int recursion[PERF_NR_CONTEXTS]; + u8 recursion[PERF_NR_CONTEXTS]; }; static DEFINE_PER_CPU(struct swevent_htable, swevent_htable); diff --git a/kernel/events/internal.h b/kernel/events/internal.h index 386d21c7edfa..7f06b79b3b9f 100644 --- a/kernel/events/internal.h +++ b/kernel/events/internal.h @@ -208,7 +208,7 @@ arch_perf_out_copy_user(void *dst, const void *src, unsigned long n) DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) -static inline int get_recursion_context(int *recursion) +static inline int get_recursion_context(u8 *recursion) { unsigned char rctx = interrupt_context_level(); @@ -221,7 +221,7 @@ static inline int get_recursion_context(int *recursion) return rctx; } -static inline void put_recursion_context(int *recursion, int rctx) +static inline void put_recursion_context(u8 *recursion, int rctx) { barrier(); recursion[rctx]--; |