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mm, tracing: record slab name for kmem_cache_free() 

Currently, a trace record generated by the RCU core is as below.

... kmem_cache_free: call_site=rcu_core+0x1fd/0x610 ptr=00000000f3b49a66

It doesn't tell us what the RCU core has freed.

This patch adds the slab name to trace_kmem_cache_free().
The new format is as follows.

... kmem_cache_free: call_site=rcu_core+0x1fd/0x610 ptr=0000000037f79c8d name=dentry
... kmem_cache_free: call_site=rcu_core+0x1fd/0x610 ptr=00000000f78cb7b5 name=sock_inode_cache
... kmem_cache_free: call_site=rcu_core+0x1fd/0x610 ptr=0000000018768985 name=pool_workqueue
... kmem_cache_free: call_site=rcu_core+0x1fd/0x610 ptr=000000006a6cb484 name=radix_tree_node

We can use it to understand what the RCU core is going to free. For
example, some users maybe interested in when the RCU core starts
freeing reclaimable slabs like dentry to reduce memory pressure.

Link: https://lkml.kernel.org/r/20201216072804.8838-1-jian.w.wen@oracle.com
Signed-off-by: Jacob Wen <jian.w.wen@oracle.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jacob Wen 2021-02-24 12:00:55 -08:00 committed by Linus Torvalds
parent 93da400397
commit 3544de8ee6
4 changed files with 19 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
include/trace/events/kmem.h
View File

@ -115,7 +115,7 @@ DEFINE_EVENT(kmem_alloc_node, kmem_cache_alloc_node,
TP_ARGS(call_site, ptr, bytes_req, bytes_alloc, gfp_flags, node)
);
DECLARE_EVENT_CLASS(kmem_free,
TRACE_EVENT(kfree,
TP_PROTO(unsigned long call_site, const void *ptr),
@ -135,18 +135,26 @@ DECLARE_EVENT_CLASS(kmem_free,
(void *)__entry->call_site, __entry->ptr)
);
DEFINE_EVENT(kmem_free, kfree,
TRACE_EVENT(kmem_cache_free,
TP_PROTO(unsigned long call_site, const void *ptr),
TP_PROTO(unsigned long call_site, const void *ptr, const char *name),
TP_ARGS(call_site, ptr)
);
TP_ARGS(call_site, ptr, name),
DEFINE_EVENT(kmem_free, kmem_cache_free,
TP_STRUCT__entry(
__field( unsigned long, call_site )
__field( const void *, ptr )
__field( const char *, name )
),
TP_PROTO(unsigned long call_site, const void *ptr),
TP_fast_assign(
__entry->call_site = call_site;
__entry->ptr = ptr;
__entry->name = name;
),
TP_ARGS(call_site, ptr)
TP_printk("call_site=%pS ptr=%p name=%s",
(void *)__entry->call_site, __entry->ptr, __entry->name)
);
TRACE_EVENT(mm_page_free,

2
mm/slab.c
View File

@ -3717,7 +3717,7 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp)
__cache_free(cachep, objp, _RET_IP_);
local_irq_restore(flags);
trace_kmem_cache_free(_RET_IP_, objp);
trace_kmem_cache_free(_RET_IP_, objp, cachep->name);
}
EXPORT_SYMBOL(kmem_cache_free);

2
mm/slob.c
View File

@ -673,7 +673,7 @@ void kmem_cache_free(struct kmem_cache *c, void *b)
__kmem_cache_free(b, c->size);
}
trace_kmem_cache_free(_RET_IP_, b);
trace_kmem_cache_free(_RET_IP_, b, c->name);
}
EXPORT_SYMBOL(kmem_cache_free);

2
mm/slub.c
View File

@ -3157,7 +3157,7 @@ void kmem_cache_free(struct kmem_cache *s, void *x)
if (!s)
return;
slab_free(s, virt_to_head_page(x), x, NULL, 1, _RET_IP_);
trace_kmem_cache_free(_RET_IP_, x);
trace_kmem_cache_free(_RET_IP_, x, s->name);
}
EXPORT_SYMBOL(kmem_cache_free);