f2fs: add tracepoints for GC threads

Add tracepoints for tracing the garbage collector
threads in f2fs with status of collection & type.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
[Jaegeuk: modify slightly to show information]
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 37b05e1..1ca3324 100644 (file)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -23,6 +23,7 @@
 #include "node.h"
 #include "segment.h"
 #include "gc.h"
+#include <trace/events/f2fs.h>
 
 static struct kmem_cache *winode_slab;
 
@@ -301,6 +302,10 @@ got_it:
                                set_bit(secno, dirty_i->victim_secmap);
                }
                *result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
+
+               trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
+                               sbi->cur_victim_sec,
+                               prefree_segments(sbi), free_segments(sbi));
        }
        mutex_unlock(&dirty_i->seglist_lock);
 

diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 924e69a..6f7cf7a 100644 (file)
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -18,6 +18,33 @@
                { WRITE_FLUSH,  "WRITE_FLUSH" },                        \
                { WRITE_FUA,    "WRITE_FUA" })
 
+#define show_data_type(type)                                           \
+       __print_symbolic(type,                                          \
+               { CURSEG_HOT_DATA,      "Hot DATA" },                   \
+               { CURSEG_WARM_DATA,     "Warm DATA" },                  \
+               { CURSEG_COLD_DATA,     "Cold DATA" },                  \
+               { CURSEG_HOT_NODE,      "Hot NODE" },                   \
+               { CURSEG_WARM_NODE,     "Warm NODE" },                  \
+               { CURSEG_COLD_NODE,     "Cold NODE" },                  \
+               { NO_CHECK_TYPE,        "No TYPE" })
+
+#define show_gc_type(type)                                             \
+       __print_symbolic(type,                                          \
+               { FG_GC,        "Foreground GC" },                      \
+               { BG_GC,        "Background GC" })
+
+#define show_alloc_mode(type)                                          \
+       __print_symbolic(type,                                          \
+               { LFS,  "LFS-mode" },                                   \
+               { SSR,  "SSR-mode" })
+
+#define show_victim_policy(type)                                       \
+       __print_symbolic(type,                                          \
+               { GC_GREEDY,    "Greedy" },                             \
+               { GC_CB,        "Cost-Benefit" })
+
+struct victim_sel_policy;
+
 DECLARE_EVENT_CLASS(f2fs__inode,
 
        TP_PROTO(struct inode *inode),
@@ -439,6 +466,54 @@ TRACE_EVENT(f2fs_get_data_block,
                __entry->ret)
 );
 
+TRACE_EVENT(f2fs_get_victim,
+
+       TP_PROTO(struct super_block *sb, int type, int gc_type,
+                       struct victim_sel_policy *p, unsigned int pre_victim,
+                       unsigned int prefree, unsigned int free),
+
+       TP_ARGS(sb, type, gc_type, p, pre_victim, prefree, free),
+
+       TP_STRUCT__entry(
+               __field(dev_t,  dev)
+               __field(int,    type)
+               __field(int,    gc_type)
+               __field(int,    alloc_mode)
+               __field(int,    gc_mode)
+               __field(unsigned int,   victim)
+               __field(unsigned int,   ofs_unit)
+               __field(unsigned int,   pre_victim)
+               __field(unsigned int,   prefree)
+               __field(unsigned int,   free)
+       ),
+
+       TP_fast_assign(
+               __entry->dev            = sb->s_dev;
+               __entry->type           = type;
+               __entry->gc_type        = gc_type;
+               __entry->alloc_mode     = p->alloc_mode;
+               __entry->gc_mode        = p->gc_mode;
+               __entry->victim         = p->min_segno;
+               __entry->ofs_unit       = p->ofs_unit;
+               __entry->pre_victim     = pre_victim;
+               __entry->prefree        = prefree;
+               __entry->free           = free;
+       ),
+
+       TP_printk("dev = (%d,%d), type = %s, policy = (%s, %s, %s), victim = %u "
+               "ofs_unit = %u, pre_victim_secno = %d, prefree = %u, free = %u",
+               show_dev(__entry),
+               show_data_type(__entry->type),
+               show_gc_type(__entry->gc_type),
+               show_alloc_mode(__entry->alloc_mode),
+               show_victim_policy(__entry->gc_mode),
+               __entry->victim,
+               __entry->ofs_unit,
+               (int)__entry->pre_victim,
+               __entry->prefree,
+               __entry->free)
+);
+
 #endif /* _TRACE_F2FS_H */
 
  /* This part must be outside protection */