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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-10-11 17:14:32 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-11-08 11:57:07 -0800 |
| commit | 7bd8f2a74bcbd39f4277766f4d49441c45dd10a0 (patch) | |
| tree | 53b348112b73c8d2d1224250096d8aaacc7c7c5a /kernel/rcutree_trace.c | |
| parent | 6ee0886ff6c81526bf6ad8521d843b934aafa5aa (diff) | |
| download | lwn-7bd8f2a74bcbd39f4277766f4d49441c45dd10a0.tar.gz lwn-7bd8f2a74bcbd39f4277766f4d49441c45dd10a0.zip | |
rcu: Add tracing for synchronize_sched_expedited()
This commit adds a per-RCU-flavor "rcuexp" file that dumps out
statistics for synchonize_sched_expedited().
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree_trace.c')
| -rw-r--r-- | kernel/rcutree_trace.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c index 967115c508bc..f9512687a6e5 100644 --- a/kernel/rcutree_trace.c +++ b/kernel/rcutree_trace.c @@ -173,6 +173,38 @@ static const struct file_operations rcudata_fops = { .release = seq_release, }; +static int show_rcuexp(struct seq_file *m, void *v) +{ + struct rcu_state *rsp = (struct rcu_state *)m->private; + + seq_printf(m, "s=%lu d=%lu w=%lu tf=%lu wd1=%lu wd2=%lu n=%lu sc=%lu dt=%lu dl=%lu dx=%lu\n", + atomic_long_read(&rsp->expedited_start), + atomic_long_read(&rsp->expedited_done), + atomic_long_read(&rsp->expedited_wrap), + atomic_long_read(&rsp->expedited_tryfail), + atomic_long_read(&rsp->expedited_workdone1), + atomic_long_read(&rsp->expedited_workdone2), + atomic_long_read(&rsp->expedited_normal), + atomic_long_read(&rsp->expedited_stoppedcpus), + atomic_long_read(&rsp->expedited_done_tries), + atomic_long_read(&rsp->expedited_done_lost), + atomic_long_read(&rsp->expedited_done_exit)); + return 0; +} + +static int rcuexp_open(struct inode *inode, struct file *file) +{ + return single_open(file, show_rcuexp, inode->i_private); +} + +static const struct file_operations rcuexp_fops = { + .owner = THIS_MODULE, + .open = rcuexp_open, + .read = seq_read, + .llseek = no_llseek, + .release = seq_release, +}; + #ifdef CONFIG_RCU_BOOST static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp) @@ -405,6 +437,11 @@ static int __init rcutree_trace_init(void) if (!retval) goto free_out; + retval = debugfs_create_file("rcuexp", 0444, + rspdir, rsp, &rcuexp_fops); + if (!retval) + goto free_out; + retval = debugfs_create_file("rcu_pending", 0444, rspdir, rsp, &rcu_pending_fops); if (!retval) |