#include <linux/debugfs.h>
#include <linux/seq_file.h>
+struct wb_stats {
+ unsigned long nr_dirty;
+ unsigned long nr_io;
+ unsigned long nr_more_io;
+ unsigned long nr_dirty_time;
+ unsigned long nr_writeback;
+ unsigned long nr_reclaimable;
+ unsigned long nr_dirtied;
+ unsigned long nr_written;
+ unsigned long dirty_thresh;
+ unsigned long wb_thresh;
+};
+
static struct dentry *bdi_debug_root;
static void bdi_debug_init(void)
bdi_debug_root = debugfs_create_dir("bdi", NULL);
}
-static int bdi_debug_stats_show(struct seq_file *m, void *v)
+static void collect_wb_stats(struct wb_stats *stats,
+ struct bdi_writeback *wb)
{
- struct backing_dev_info *bdi = m->private;
- struct bdi_writeback *wb = &bdi->wb;
- unsigned long background_thresh;
- unsigned long dirty_thresh;
- unsigned long wb_thresh;
- unsigned long nr_dirty, nr_io, nr_more_io, nr_dirty_time;
struct inode *inode;
- nr_dirty = nr_io = nr_more_io = nr_dirty_time = 0;
spin_lock(&wb->list_lock);
list_for_each_entry(inode, &wb->b_dirty, i_io_list)
- nr_dirty++;
+ stats->nr_dirty++;
list_for_each_entry(inode, &wb->b_io, i_io_list)
- nr_io++;
+ stats->nr_io++;
list_for_each_entry(inode, &wb->b_more_io, i_io_list)
- nr_more_io++;
+ stats->nr_more_io++;
list_for_each_entry(inode, &wb->b_dirty_time, i_io_list)
if (inode->i_state & I_DIRTY_TIME)
- nr_dirty_time++;
+ stats->nr_dirty_time++;
spin_unlock(&wb->list_lock);
+ stats->nr_writeback += wb_stat(wb, WB_WRITEBACK);
+ stats->nr_reclaimable += wb_stat(wb, WB_RECLAIMABLE);
+ stats->nr_dirtied += wb_stat(wb, WB_DIRTIED);
+ stats->nr_written += wb_stat(wb, WB_WRITTEN);
+ stats->wb_thresh += wb_calc_thresh(wb, stats->dirty_thresh);
+}
+
+#ifdef CONFIG_CGROUP_WRITEBACK
+static void bdi_collect_stats(struct backing_dev_info *bdi,
+ struct wb_stats *stats)
+{
+ struct bdi_writeback *wb;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node) {
+ if (!wb_tryget(wb))
+ continue;
+
+ collect_wb_stats(stats, wb);
+ wb_put(wb);
+ }
+ rcu_read_unlock();
+}
+#else
+static void bdi_collect_stats(struct backing_dev_info *bdi,
+ struct wb_stats *stats)
+{
+ collect_wb_stats(stats, &bdi->wb);
+}
+#endif
+
+static int bdi_debug_stats_show(struct seq_file *m, void *v)
+{
+ struct backing_dev_info *bdi = m->private;
+ unsigned long background_thresh;
+ unsigned long dirty_thresh;
+ struct wb_stats stats;
+ unsigned long tot_bw;
+
global_dirty_limits(&background_thresh, &dirty_thresh);
- wb_thresh = wb_calc_thresh(wb, dirty_thresh);
+
+ memset(&stats, 0, sizeof(stats));
+ stats.dirty_thresh = dirty_thresh;
+ bdi_collect_stats(bdi, &stats);
+ tot_bw = atomic_long_read(&bdi->tot_write_bandwidth);
seq_printf(m,
"BdiWriteback: %10lu kB\n"
"b_dirty_time: %10lu\n"
"bdi_list: %10u\n"
"state: %10lx\n",
- (unsigned long) K(wb_stat(wb, WB_WRITEBACK)),
- (unsigned long) K(wb_stat(wb, WB_RECLAIMABLE)),
- K(wb_thresh),
+ K(stats.nr_writeback),
+ K(stats.nr_reclaimable),
+ K(stats.wb_thresh),
K(dirty_thresh),
K(background_thresh),
- (unsigned long) K(wb_stat(wb, WB_DIRTIED)),
- (unsigned long) K(wb_stat(wb, WB_WRITTEN)),
- (unsigned long) K(wb->write_bandwidth),
- nr_dirty,
- nr_io,
- nr_more_io,
- nr_dirty_time,
+ K(stats.nr_dirtied),
+ K(stats.nr_written),
+ K(tot_bw),
+ stats.nr_dirty,
+ stats.nr_io,
+ stats.nr_more_io,
+ stats.nr_dirty_time,
!list_empty(&bdi->bdi_list), bdi->wb.state);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(bdi_debug_stats);
+static void wb_stats_show(struct seq_file *m, struct bdi_writeback *wb,
+ struct wb_stats *stats)
+{
+
+ seq_printf(m,
+ "WbCgIno: %10lu\n"
+ "WbWriteback: %10lu kB\n"
+ "WbReclaimable: %10lu kB\n"
+ "WbDirtyThresh: %10lu kB\n"
+ "WbDirtied: %10lu kB\n"
+ "WbWritten: %10lu kB\n"
+ "WbWriteBandwidth: %10lu kBps\n"
+ "b_dirty: %10lu\n"
+ "b_io: %10lu\n"
+ "b_more_io: %10lu\n"
+ "b_dirty_time: %10lu\n"
+ "state: %10lx\n\n",
+#ifdef CONFIG_CGROUP_WRITEBACK
+ cgroup_ino(wb->memcg_css->cgroup),
+#else
+ 1ul,
+#endif
+ K(stats->nr_writeback),
+ K(stats->nr_reclaimable),
+ K(stats->wb_thresh),
+ K(stats->nr_dirtied),
+ K(stats->nr_written),
+ K(wb->avg_write_bandwidth),
+ stats->nr_dirty,
+ stats->nr_io,
+ stats->nr_more_io,
+ stats->nr_dirty_time,
+ wb->state);
+}
+
+static int cgwb_debug_stats_show(struct seq_file *m, void *v)
+{
+ struct backing_dev_info *bdi = m->private;
+ unsigned long background_thresh;
+ unsigned long dirty_thresh;
+ struct bdi_writeback *wb;
+
+ global_dirty_limits(&background_thresh, &dirty_thresh);
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node) {
+ struct wb_stats stats = { .dirty_thresh = dirty_thresh };
+
+ if (!wb_tryget(wb))
+ continue;
+
+ collect_wb_stats(&stats, wb);
+
+ /*
+ * Calculate thresh of wb in writeback cgroup which is min of
+ * thresh in global domain and thresh in cgroup domain. Drop
+ * rcu lock because cgwb_calc_thresh may sleep in
+ * cgroup_rstat_flush. We can do so here because we have a ref.
+ */
+ if (mem_cgroup_wb_domain(wb)) {
+ rcu_read_unlock();
+ stats.wb_thresh = min(stats.wb_thresh, cgwb_calc_thresh(wb));
+ rcu_read_lock();
+ }
+
+ wb_stats_show(m, wb, &stats);
+
+ wb_put(wb);
+ }
+ rcu_read_unlock();
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(cgwb_debug_stats);
+
static void bdi_debug_register(struct backing_dev_info *bdi, const char *name)
{
bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root);
debugfs_create_file("stats", 0444, bdi->debug_dir, bdi,
&bdi_debug_stats_fops);
+ debugfs_create_file("wb_stats", 0444, bdi->debug_dir, bdi,
+ &cgwb_debug_stats_fops);
}
static void bdi_debug_unregister(struct backing_dev_info *bdi)
{
debugfs_remove_recursive(bdi->debug_dir);
}
-#else
+#else /* CONFIG_DEBUG_FS */
static inline void bdi_debug_init(void)
{
}
static inline void bdi_debug_unregister(struct backing_dev_info *bdi)
{
}
-#endif
+#endif /* CONFIG_DEBUG_FS */
static ssize_t read_ahead_kb_store(struct device *dev,
struct device_attribute *attr,
static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
gfp_t gfp)
{
- int i, err;
+ int err;
memset(wb, 0, sizeof(*wb));
if (err)
return err;
- for (i = 0; i < NR_WB_STAT_ITEMS; i++) {
- err = percpu_counter_init(&wb->stat[i], 0, gfp);
- if (err)
- goto out_destroy_stat;
- }
-
- return 0;
+ err = percpu_counter_init_many(wb->stat, 0, gfp, NR_WB_STAT_ITEMS);
+ if (err)
+ fprop_local_destroy_percpu(&wb->completions);
-out_destroy_stat:
- while (i--)
- percpu_counter_destroy(&wb->stat[i]);
- fprop_local_destroy_percpu(&wb->completions);
return err;
}
static void wb_exit(struct bdi_writeback *wb)
{
- int i;
-
WARN_ON(delayed_work_pending(&wb->dwork));
-
- for (i = 0; i < NR_WB_STAT_ITEMS; i++)
- percpu_counter_destroy(&wb->stat[i]);
-
+ percpu_counter_destroy_many(wb->stat, NR_WB_STAT_ITEMS);
fprop_local_destroy_percpu(&wb->completions);
}
projects / linux-2.6-microblaze.git / blobdiff