diff options
Diffstat (limited to 'mm/mmap_lock.c')
| -rw-r--r-- | mm/mmap_lock.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/mm/mmap_lock.c b/mm/mmap_lock.c new file mode 100644 index 000000000000..dcdde4f722a4 --- /dev/null +++ b/mm/mmap_lock.c @@ -0,0 +1,230 @@ +// SPDX-License-Identifier: GPL-2.0 +#define CREATE_TRACE_POINTS +#include <trace/events/mmap_lock.h> + +#include <linux/mm.h> +#include <linux/cgroup.h> +#include <linux/memcontrol.h> +#include <linux/mmap_lock.h> +#include <linux/mutex.h> +#include <linux/percpu.h> +#include <linux/rcupdate.h> +#include <linux/smp.h> +#include <linux/trace_events.h> + +EXPORT_TRACEPOINT_SYMBOL(mmap_lock_start_locking); +EXPORT_TRACEPOINT_SYMBOL(mmap_lock_acquire_returned); +EXPORT_TRACEPOINT_SYMBOL(mmap_lock_released); + +#ifdef CONFIG_MEMCG + +/* + * Our various events all share the same buffer (because we don't want or need + * to allocate a set of buffers *per event type*), so we need to protect against + * concurrent _reg() and _unreg() calls, and count how many _reg() calls have + * been made. + */ +static DEFINE_MUTEX(reg_lock); +static int reg_refcount; /* Protected by reg_lock. */ + +/* + * Size of the buffer for memcg path names. Ignoring stack trace support, + * trace_events_hist.c uses MAX_FILTER_STR_VAL for this, so we also use it. + */ +#define MEMCG_PATH_BUF_SIZE MAX_FILTER_STR_VAL + +/* + * How many contexts our trace events might be called in: normal, softirq, irq, + * and NMI. + */ +#define CONTEXT_COUNT 4 + +static DEFINE_PER_CPU(char __rcu *, memcg_path_buf); +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) +{ + int cpu; + char **old = tmp_bufs; + + for_each_possible_cpu(cpu) { + *(old++) = rcu_dereference_protected( + per_cpu(memcg_path_buf, cpu), + lockdep_is_held(®_lock)); + rcu_assign_pointer(per_cpu(memcg_path_buf, cpu), NULL); + } + + /* Wait for inflight memcg_path_buf users to finish. */ + synchronize_rcu(); + + old = tmp_bufs; + for_each_possible_cpu(cpu) { + kfree(*(old++)); + } + + kfree(tmp_bufs); + tmp_bufs = NULL; +} + +int trace_mmap_lock_reg(void) +{ + int cpu; + char *new; + + mutex_lock(®_lock); + + /* If the refcount is going 0->1, proceed with allocating buffers. */ + if (reg_refcount++) + goto out; + + tmp_bufs = kmalloc_array(num_possible_cpus(), sizeof(*tmp_bufs), + GFP_KERNEL); + if (tmp_bufs == NULL) + goto out_fail; + + for_each_possible_cpu(cpu) { + 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); + /* Don't need to wait for inflights, they'd have gotten NULL. */ + } + +out: + mutex_unlock(®_lock); + return 0; + +out_fail_free: + free_memcg_path_bufs(); +out_fail: + /* Since we failed, undo the earlier ref increment. */ + --reg_refcount; + + mutex_unlock(®_lock); + return -ENOMEM; +} + +void trace_mmap_lock_unreg(void) +{ + mutex_lock(®_lock); + + /* If the refcount is going 1->0, proceed with freeing buffers. */ + if (--reg_refcount) + goto out; + + free_memcg_path_bufs(); + +out: + mutex_unlock(®_lock); +} + +static inline char *get_memcg_path_buf(void) +{ + char *buf; + int idx; + + rcu_read_lock(); + buf = rcu_dereference(*this_cpu_ptr(&memcg_path_buf)); + if (buf == NULL) { + rcu_read_unlock(); + return NULL; + } + idx = this_cpu_add_return(memcg_path_buf_idx, MEMCG_PATH_BUF_SIZE) - + 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); + rcu_read_unlock(); +} + +/* + * Write the given mm_struct's memcg path to a percpu buffer, and return a + * pointer to it. If the path cannot be determined, or no buffer was available + * (because the trace event is being unregistered), NULL is returned. + * + * Note: buffers are allocated per-cpu to avoid locking, so preemption must be + * disabled by the caller before calling us, and re-enabled only after the + * caller is done with the pointer. + * + * The caller must call put_memcg_path_buf() once the buffer is no longer + * needed. This must be done while preemption is still disabled. + */ +static const char *get_mm_memcg_path(struct mm_struct *mm) +{ + char *buf = NULL; + struct mem_cgroup *memcg = get_mem_cgroup_from_mm(mm); + + if (memcg == NULL) + goto out; + if (unlikely(memcg->css.cgroup == NULL)) + goto out_put; + + buf = get_memcg_path_buf(); + if (buf == NULL) + goto out_put; + + cgroup_path(memcg->css.cgroup, buf, MEMCG_PATH_BUF_SIZE); + +out_put: + css_put(&memcg->css); +out: + return buf; +} + +#define TRACE_MMAP_LOCK_EVENT(type, mm, ...) \ + do { \ + const char *memcg_path; \ + preempt_disable(); \ + 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(); \ + } while (0) + +#else /* !CONFIG_MEMCG */ + +int trace_mmap_lock_reg(void) +{ + return 0; +} + +void trace_mmap_lock_unreg(void) +{ +} + +#define TRACE_MMAP_LOCK_EVENT(type, mm, ...) \ + trace_mmap_lock_##type(mm, "", ##__VA_ARGS__) + +#endif /* CONFIG_MEMCG */ + +/* + * Trace calls must be in a separate file, as otherwise there's a circular + * dependency between linux/mmap_lock.h and trace/events/mmap_lock.h. + */ + +void __mmap_lock_do_trace_start_locking(struct mm_struct *mm, bool write) +{ + TRACE_MMAP_LOCK_EVENT(start_locking, mm, write); +} +EXPORT_SYMBOL(__mmap_lock_do_trace_start_locking); + +void __mmap_lock_do_trace_acquire_returned(struct mm_struct *mm, bool write, + bool success) +{ + TRACE_MMAP_LOCK_EVENT(acquire_returned, mm, write, success); +} +EXPORT_SYMBOL(__mmap_lock_do_trace_acquire_returned); + +void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write) +{ + TRACE_MMAP_LOCK_EVENT(released, mm, write); +} +EXPORT_SYMBOL(__mmap_lock_do_trace_released); |