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authorNicolas Saenz Julienne <nsaenzju@redhat.com>2021-06-29 05:35:13 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-06-29 20:53:47 +0300
commit832b50725373e8c46781b7d4db104ec9cf564a6b (patch)
treefef34e8a45b2d2716095842e5b785f2c1241c18c
parent65ac1a60a57e2c55f2ac37f27095f6b012295e81 (diff)
downloadlinux-832b50725373e8c46781b7d4db104ec9cf564a6b.tar.xz
mm: mmap_lock: use local locks instead of disabling preemption
mmap_lock will explicitly disable/enable preemption upon manipulating its local CPU variables. This is to be expected, but in this case, it doesn't play well with PREEMPT_RT. The preemption disabled code section also takes a spin-lock. Spin-locks in RT systems will try to schedule, which is exactly what we're trying to avoid. To mitigate this, convert the explicit preemption handling to local_locks. Which are RT aware, and will disable migration instead of preemption when PREEMPT_RT=y. The faulty call trace looks like the following: __mmap_lock_do_trace_*() preempt_disable() get_mm_memcg_path() cgroup_path() kernfs_path_from_node() spin_lock_irqsave() /* Scheduling while atomic! */ Link: https://lkml.kernel.org/r/20210604163506.2103900-1-nsaenzju@redhat.com Fixes: 2b5067a8143e3 ("mm: mmap_lock: add tracepoints around lock acquisition ") Signed-off-by: Nicolas Saenz Julienne <nsaenzju@redhat.com> Tested-by: Axel Rasmussen <axelrasmussen@google.com> Reviewed-by: Axel Rasmussen <axelrasmussen@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/mmap_lock.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/mm/mmap_lock.c b/mm/mmap_lock.c
index dcdde4f722a4..2ae3f33b85b1 100644
--- a/mm/mmap_lock.c
+++ b/mm/mmap_lock.c
@@ -11,6 +11,7 @@
#include <linux/rcupdate.h>
#include <linux/smp.h>
#include <linux/trace_events.h>
+#include <linux/local_lock.h>
EXPORT_TRACEPOINT_SYMBOL(mmap_lock_start_locking);
EXPORT_TRACEPOINT_SYMBOL(mmap_lock_acquire_returned);
@@ -39,21 +40,30 @@ static int reg_refcount; /* Protected by reg_lock. */
*/
#define CONTEXT_COUNT 4
-static DEFINE_PER_CPU(char __rcu *, memcg_path_buf);
+struct memcg_path {
+ local_lock_t lock;
+ char __rcu *buf;
+ local_t buf_idx;
+};
+static DEFINE_PER_CPU(struct memcg_path, memcg_paths) = {
+ .lock = INIT_LOCAL_LOCK(lock),
+ .buf_idx = LOCAL_INIT(0),
+};
+
static char **tmp_bufs;
-static DEFINE_PER_CPU(int, memcg_path_buf_idx);
/* Called with reg_lock held. */
static void free_memcg_path_bufs(void)
{
+ struct memcg_path *memcg_path;
int cpu;
char **old = tmp_bufs;
for_each_possible_cpu(cpu) {
- *(old++) = rcu_dereference_protected(
- per_cpu(memcg_path_buf, cpu),
+ memcg_path = per_cpu_ptr(&memcg_paths, cpu);
+ *(old++) = rcu_dereference_protected(memcg_path->buf,
lockdep_is_held(&reg_lock));
- rcu_assign_pointer(per_cpu(memcg_path_buf, cpu), NULL);
+ rcu_assign_pointer(memcg_path->buf, NULL);
}
/* Wait for inflight memcg_path_buf users to finish. */
@@ -88,7 +98,7 @@ int trace_mmap_lock_reg(void)
new = kmalloc(MEMCG_PATH_BUF_SIZE * CONTEXT_COUNT, GFP_KERNEL);
if (new == NULL)
goto out_fail_free;
- rcu_assign_pointer(per_cpu(memcg_path_buf, cpu), new);
+ rcu_assign_pointer(per_cpu_ptr(&memcg_paths, cpu)->buf, new);
/* Don't need to wait for inflights, they'd have gotten NULL. */
}
@@ -122,23 +132,24 @@ out:
static inline char *get_memcg_path_buf(void)
{
+ struct memcg_path *memcg_path = this_cpu_ptr(&memcg_paths);
char *buf;
int idx;
rcu_read_lock();
- buf = rcu_dereference(*this_cpu_ptr(&memcg_path_buf));
+ buf = rcu_dereference(memcg_path->buf);
if (buf == NULL) {
rcu_read_unlock();
return NULL;
}
- idx = this_cpu_add_return(memcg_path_buf_idx, MEMCG_PATH_BUF_SIZE) -
+ idx = local_add_return(MEMCG_PATH_BUF_SIZE, &memcg_path->buf_idx) -
MEMCG_PATH_BUF_SIZE;
return &buf[idx];
}
static inline void put_memcg_path_buf(void)
{
- this_cpu_sub(memcg_path_buf_idx, MEMCG_PATH_BUF_SIZE);
+ local_sub(MEMCG_PATH_BUF_SIZE, &this_cpu_ptr(&memcg_paths)->buf_idx);
rcu_read_unlock();
}
@@ -179,14 +190,14 @@ out:
#define TRACE_MMAP_LOCK_EVENT(type, mm, ...) \
do { \
const char *memcg_path; \
- preempt_disable(); \
+ local_lock(&memcg_paths.lock); \
memcg_path = get_mm_memcg_path(mm); \
trace_mmap_lock_##type(mm, \
memcg_path != NULL ? memcg_path : "", \
##__VA_ARGS__); \
if (likely(memcg_path != NULL)) \
put_memcg_path_buf(); \
- preempt_enable(); \
+ local_unlock(&memcg_paths.lock); \
} while (0)
#else /* !CONFIG_MEMCG */