tracing, writeback: Replace cgroup path to cgroup ino

[karo-tx-linux.git] / include / trace / events / writeback.h

diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index fff846b512e6e675043a37d3d5c7cb804b71cbe8..73614ce1d20404ace9176502486a840df2cf926e 100644 (file)
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -134,58 +134,28 @@ DEFINE_EVENT(writeback_dirty_inode_template, writeback_dirty_inode,
 #ifdef CREATE_TRACE_POINTS
 #ifdef CONFIG_CGROUP_WRITEBACK
 
-static inline size_t __trace_wb_cgroup_size(struct bdi_writeback *wb)
+static inline unsigned int __trace_wb_assign_cgroup(struct bdi_writeback *wb)
 {
-       return kernfs_path_len(wb->memcg_css->cgroup->kn) + 1;
+       return wb->memcg_css->cgroup->kn->ino;
 }
 
-static inline void __trace_wb_assign_cgroup(char *buf, struct bdi_writeback *wb)
-{
-       struct cgroup *cgrp = wb->memcg_css->cgroup;
-       char *path;
-
-       path = cgroup_path(cgrp, buf, kernfs_path_len(cgrp->kn) + 1);
-       WARN_ON_ONCE(path != buf);
-}
-
-static inline size_t __trace_wbc_cgroup_size(struct writeback_control *wbc)
-{
-       if (wbc->wb)
-               return __trace_wb_cgroup_size(wbc->wb);
-       else
-               return 2;
-}
-
-static inline void __trace_wbc_assign_cgroup(char *buf,
-                                            struct writeback_control *wbc)
+static inline unsigned int __trace_wbc_assign_cgroup(struct writeback_control *wbc)
 {
        if (wbc->wb)
-               __trace_wb_assign_cgroup(buf, wbc->wb);
+               return __trace_wb_assign_cgroup(wbc->wb);
        else
-               strcpy(buf, "/");
+               return -1U;
 }
-
 #else  /* CONFIG_CGROUP_WRITEBACK */
 
-static inline size_t __trace_wb_cgroup_size(struct bdi_writeback *wb)
-{
-       return 2;
-}
-
-static inline void __trace_wb_assign_cgroup(char *buf, struct bdi_writeback *wb)
-{
-       strcpy(buf, "/");
-}
-
-static inline size_t __trace_wbc_cgroup_size(struct writeback_control *wbc)
+static inline unsigned int __trace_wb_assign_cgroup(struct bdi_writeback *wb)
 {
-       return 2;
+       return -1U;
 }
 
-static inline void __trace_wbc_assign_cgroup(char *buf,
-                                            struct writeback_control *wbc)
+static inline unsigned int __trace_wbc_assign_cgroup(struct writeback_control *wbc)
 {
-       strcpy(buf, "/");
+       return -1U;
 }
 
 #endif /* CONFIG_CGROUP_WRITEBACK */
@@ -201,7 +171,7 @@ DECLARE_EVENT_CLASS(writeback_write_inode_template,
                __array(char, name, 32)
                __field(unsigned long, ino)
                __field(int, sync_mode)
-               __dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
+               __field(unsigned int, cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -209,14 +179,14 @@ DECLARE_EVENT_CLASS(writeback_write_inode_template,
                        dev_name(inode_to_bdi(inode)->dev), 32);
                __entry->ino            = inode->i_ino;
                __entry->sync_mode      = wbc->sync_mode;
-               __trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
+               __entry->cgroup_ino     = __trace_wbc_assign_cgroup(wbc);
        ),
 
-       TP_printk("bdi %s: ino=%lu sync_mode=%d cgroup=%s",
+       TP_printk("bdi %s: ino=%lu sync_mode=%d cgroup_ino=%u",
                __entry->name,
                __entry->ino,
                __entry->sync_mode,
-               __get_str(cgroup)
+               __entry->cgroup_ino
        )
 );
 
@@ -246,7 +216,7 @@ DECLARE_EVENT_CLASS(writeback_work_class,
                __field(int, range_cyclic)
                __field(int, for_background)
                __field(int, reason)
-               __dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
+               __field(unsigned int, cgroup_ino)
        ),
        TP_fast_assign(
                strncpy(__entry->name,
@@ -258,10 +228,10 @@ DECLARE_EVENT_CLASS(writeback_work_class,
                __entry->range_cyclic = work->range_cyclic;
                __entry->for_background = work->for_background;
                __entry->reason = work->reason;
-               __trace_wb_assign_cgroup(__get_str(cgroup), wb);
+               __entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
        ),
        TP_printk("bdi %s: sb_dev %d:%d nr_pages=%ld sync_mode=%d "
-                 "kupdate=%d range_cyclic=%d background=%d reason=%s cgroup=%s",
+                 "kupdate=%d range_cyclic=%d background=%d reason=%s cgroup_ino=%u",
                  __entry->name,
                  MAJOR(__entry->sb_dev), MINOR(__entry->sb_dev),
                  __entry->nr_pages,
@@ -270,7 +240,7 @@ DECLARE_EVENT_CLASS(writeback_work_class,
                  __entry->range_cyclic,
                  __entry->for_background,
                  __print_symbolic(__entry->reason, WB_WORK_REASON),
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
        )
 );
 #define DEFINE_WRITEBACK_WORK_EVENT(name) \
@@ -300,15 +270,15 @@ DECLARE_EVENT_CLASS(writeback_class,
        TP_ARGS(wb),
        TP_STRUCT__entry(
                __array(char, name, 32)
-               __dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
+               __field(unsigned int, cgroup_ino)
        ),
        TP_fast_assign(
                strncpy(__entry->name, dev_name(wb->bdi->dev), 32);
-               __trace_wb_assign_cgroup(__get_str(cgroup), wb);
+               __entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
        ),
-       TP_printk("bdi %s: cgroup=%s",
+       TP_printk("bdi %s: cgroup_ino=%u",
                  __entry->name,
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
        )
 );
 #define DEFINE_WRITEBACK_EVENT(name) \
@@ -347,7 +317,7 @@ DECLARE_EVENT_CLASS(wbc_class,
                __field(int, range_cyclic)
                __field(long, range_start)
                __field(long, range_end)
-               __dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
+               __field(unsigned int, cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -361,12 +331,12 @@ DECLARE_EVENT_CLASS(wbc_class,
                __entry->range_cyclic   = wbc->range_cyclic;
                __entry->range_start    = (long)wbc->range_start;
                __entry->range_end      = (long)wbc->range_end;
-               __trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
+               __entry->cgroup_ino     = __trace_wbc_assign_cgroup(wbc);
        ),
 
        TP_printk("bdi %s: towrt=%ld skip=%ld mode=%d kupd=%d "
                "bgrd=%d reclm=%d cyclic=%d "
-               "start=0x%lx end=0x%lx cgroup=%s",
+               "start=0x%lx end=0x%lx cgroup_ino=%u",
                __entry->name,
                __entry->nr_to_write,
                __entry->pages_skipped,
@@ -377,7 +347,7 @@ DECLARE_EVENT_CLASS(wbc_class,
                __entry->range_cyclic,
                __entry->range_start,
                __entry->range_end,
-               __get_str(cgroup)
+               __entry->cgroup_ino
        )
 )
 
@@ -398,7 +368,7 @@ TRACE_EVENT(writeback_queue_io,
                __field(long,           age)
                __field(int,            moved)
                __field(int,            reason)
-               __dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
+               __field(unsigned int,   cgroup_ino)
        ),
        TP_fast_assign(
                unsigned long *older_than_this = work->older_than_this;
@@ -408,15 +378,15 @@ TRACE_EVENT(writeback_queue_io,
                                  (jiffies - *older_than_this) * 1000 / HZ : -1;
                __entry->moved  = moved;
                __entry->reason = work->reason;
-               __trace_wb_assign_cgroup(__get_str(cgroup), wb);
+               __entry->cgroup_ino     = __trace_wb_assign_cgroup(wb);
        ),
-       TP_printk("bdi %s: older=%lu age=%ld enqueue=%d reason=%s cgroup=%s",
+       TP_printk("bdi %s: older=%lu age=%ld enqueue=%d reason=%s cgroup_ino=%u",
                __entry->name,
                __entry->older, /* older_than_this in jiffies */
                __entry->age,   /* older_than_this in relative milliseconds */
                __entry->moved,
                __print_symbolic(__entry->reason, WB_WORK_REASON),
-               __get_str(cgroup)
+               __entry->cgroup_ino
        )
 );
 
@@ -484,7 +454,7 @@ TRACE_EVENT(bdi_dirty_ratelimit,
                __field(unsigned long,  dirty_ratelimit)
                __field(unsigned long,  task_ratelimit)
                __field(unsigned long,  balanced_dirty_ratelimit)
-               __dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
+               __field(unsigned int,   cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -496,13 +466,13 @@ TRACE_EVENT(bdi_dirty_ratelimit,
                __entry->task_ratelimit = KBps(task_ratelimit);
                __entry->balanced_dirty_ratelimit =
                                        KBps(wb->balanced_dirty_ratelimit);
-               __trace_wb_assign_cgroup(__get_str(cgroup), wb);
+               __entry->cgroup_ino     = __trace_wb_assign_cgroup(wb);
        ),
 
        TP_printk("bdi %s: "
                  "write_bw=%lu awrite_bw=%lu dirty_rate=%lu "
                  "dirty_ratelimit=%lu task_ratelimit=%lu "
-                 "balanced_dirty_ratelimit=%lu cgroup=%s",
+                 "balanced_dirty_ratelimit=%lu cgroup_ino=%u",
                  __entry->bdi,
                  __entry->write_bw,            /* write bandwidth */
                  __entry->avg_write_bw,        /* avg write bandwidth */
@@ -510,7 +480,7 @@ TRACE_EVENT(bdi_dirty_ratelimit,
                  __entry->dirty_ratelimit,     /* base ratelimit */
                  __entry->task_ratelimit, /* ratelimit with position control */
                  __entry->balanced_dirty_ratelimit, /* the balanced ratelimit */
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
        )
 );
 
@@ -548,7 +518,7 @@ TRACE_EVENT(balance_dirty_pages,
                __field(         long,  pause)
                __field(unsigned long,  period)
                __field(         long,  think)
-               __dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
+               __field(unsigned int,   cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -571,7 +541,7 @@ TRACE_EVENT(balance_dirty_pages,
                __entry->period         = period * 1000 / HZ;
                __entry->pause          = pause * 1000 / HZ;
                __entry->paused         = (jiffies - start_time) * 1000 / HZ;
-               __trace_wb_assign_cgroup(__get_str(cgroup), wb);
+               __entry->cgroup_ino     = __trace_wb_assign_cgroup(wb);
        ),
 
 
@@ -580,7 +550,7 @@ TRACE_EVENT(balance_dirty_pages,
                  "bdi_setpoint=%lu bdi_dirty=%lu "
                  "dirty_ratelimit=%lu task_ratelimit=%lu "
                  "dirtied=%u dirtied_pause=%u "
-                 "paused=%lu pause=%ld period=%lu think=%ld cgroup=%s",
+                 "paused=%lu pause=%ld period=%lu think=%ld cgroup_ino=%u",
                  __entry->bdi,
                  __entry->limit,
                  __entry->setpoint,
@@ -595,7 +565,7 @@ TRACE_EVENT(balance_dirty_pages,
                  __entry->pause,       /* ms */
                  __entry->period,      /* ms */
                  __entry->think,       /* ms */
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
          )
 );
 
@@ -609,8 +579,7 @@ TRACE_EVENT(writeback_sb_inodes_requeue,
                __field(unsigned long, ino)
                __field(unsigned long, state)
                __field(unsigned long, dirtied_when)
-               __dynamic_array(char, cgroup,
-                               __trace_wb_cgroup_size(inode_to_wb(inode)))
+               __field(unsigned int, cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -619,16 +588,16 @@ TRACE_EVENT(writeback_sb_inodes_requeue,
                __entry->ino            = inode->i_ino;
                __entry->state          = inode->i_state;
                __entry->dirtied_when   = inode->dirtied_when;
-               __trace_wb_assign_cgroup(__get_str(cgroup), inode_to_wb(inode));
+               __entry->cgroup_ino     = __trace_wb_assign_cgroup(inode_to_wb(inode));
        ),
 
-       TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu cgroup=%s",
+       TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu cgroup_ino=%u",
                  __entry->name,
                  __entry->ino,
                  show_inode_state(__entry->state),
                  __entry->dirtied_when,
                  (jiffies - __entry->dirtied_when) / HZ,
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
        )
 );
 
@@ -684,7 +653,7 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
                __field(unsigned long, writeback_index)
                __field(long, nr_to_write)
                __field(unsigned long, wrote)
-               __dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
+               __field(unsigned int, cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -696,11 +665,11 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
                __entry->writeback_index = inode->i_mapping->writeback_index;
                __entry->nr_to_write    = nr_to_write;
                __entry->wrote          = nr_to_write - wbc->nr_to_write;
-               __trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
+               __entry->cgroup_ino     = __trace_wbc_assign_cgroup(wbc);
        ),
 
        TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu "
-                 "index=%lu to_write=%ld wrote=%lu cgroup=%s",
+                 "index=%lu to_write=%ld wrote=%lu cgroup_ino=%u",
                  __entry->name,
                  __entry->ino,
                  show_inode_state(__entry->state),
@@ -709,7 +678,7 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
                  __entry->writeback_index,
                  __entry->nr_to_write,
                  __entry->wrote,
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
        )
 );