• Peter Zijlstra's avatar
    tracing: add lockdep tracepoints for lock acquire/release · efed792d
    Peter Zijlstra authored
    Augment the traces with lock names when lockdep is available:
    
     1)               |  down_read_trylock() {
     1)               |    _spin_lock_irqsave() {
     1)               |      /* lock_acquire: &sem->wait_lock */
     1)   4.201 us    |    }
     1)               |    _spin_unlock_irqrestore() {
     1)               |      /* lock_release: &sem->wait_lock */
     1)   3.523 us    |    }
     1)               |  /* lock_acquire: try read &mm->mmap_sem */
     1) + 13.386 us   |  }
     1)   1.635 us    |  find_vma();
     1)               |  handle_mm_fault() {
     1)               |    __do_fault() {
     1)               |      filemap_fault() {
     1)               |        find_lock_page() {
     1)               |          find_get_page() {
     1)               |            /* lock_acquire: read rcu_read_lock */
     1)               |            /* lock_release: rcu_read_lock */
     1)   5.697 us    |          }
     1)   8.158 us    |        }
     1) + 11.079 us   |      }
     1)               |      _spin_lock() {
     1)               |        /* lock_acquire: __pte_lockptr(page) */
     1)   3.949 us    |      }
     1)   1.460 us    |      page_add_file_rmap();
     1)               |      _spin_unlock() {
     1)               |        /* lock_release: __pte_lockptr(page) */
     1)   3.115 us    |      }
     1)               |      unlock_page() {
     1)   1.421 us    |        page_waitqueue();
     1)   1.220 us    |        __wake_up_bit();
     1)   6.519 us    |      }
     1) + 34.328 us   |    }
     1) + 37.452 us   |  }
     1)               |  up_read() {
     1)               |  /* lock_release: &mm->mmap_sem */
     1)               |    _spin_lock_irqsave() {
     1)               |      /* lock_acquire: &sem->wait_lock */
     1)   3.865 us    |    }
     1)               |    _spin_unlock_irqrestore() {
     1)               |      /* lock_release: &sem->wait_lock */
     1)   8.562 us    |    }
     1) + 17.370 us   |  }
    Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: =?ISO-8859-1?Q?T=F6r=F6k?= Edwin <edwintorok@gmail.com>
    Cc: Jason Baron <jbaron@redhat.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    LKML-Reference: <1236166375.5330.7209.camel@laptop>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    efed792d
lockdep.h 156 Bytes