Commit 13871bad authored by David Howells's avatar David Howells
Browse files

cachefiles: Add tracepoints for calls to the VFS 



Add tracepoints in cachefiles to monitor when it does various VFS
operations, such as mkdir.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819638517.215744.12773133137536579766.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906938316.143852.17227990869551737803.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967147139.1823006.4909879317496543392.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021546287.640689.3501604495002415631.stgit@warthog.procyon.org.uk/ # v4
parent fe2140e2

include/trace/events/cachefiles.h

+176 −0
Original line number Diff line number Diff line
@@ -18,6 +18,21 @@ 
#ifndef __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY

#define __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY



enum fscache_why_object_killed {

	FSCACHE_OBJECT_IS_STALE,

	FSCACHE_OBJECT_IS_WEIRD,

	FSCACHE_OBJECT_INVALIDATED,

	FSCACHE_OBJECT_NO_SPACE,

	FSCACHE_OBJECT_WAS_RETIRED,

	FSCACHE_OBJECT_WAS_CULLED,

};



enum cachefiles_trunc_trace {

	cachefiles_trunc_dio_adjust,

	cachefiles_trunc_expand_tmpfile,

	cachefiles_trunc_shrink,

};



enum cachefiles_error_trace {

	cachefiles_trace_fallocate_error,

	cachefiles_trace_getxattr_error,
@@ -43,6 +58,19 @@ enum cachefiles_error_trace { 
/*

 * Define enum -> string mappings for display.

 */

#define cachefiles_obj_kill_traces				\

	EM(FSCACHE_OBJECT_IS_STALE,	"stale")		\

	EM(FSCACHE_OBJECT_IS_WEIRD,	"weird")		\

	EM(FSCACHE_OBJECT_INVALIDATED,	"inval")		\

	EM(FSCACHE_OBJECT_NO_SPACE,	"no_space")		\

	EM(FSCACHE_OBJECT_WAS_RETIRED,	"was_retired")		\

	E_(FSCACHE_OBJECT_WAS_CULLED,	"was_culled")



#define cachefiles_trunc_traces						\

	EM(cachefiles_trunc_dio_adjust,		"DIOADJ")		\

	EM(cachefiles_trunc_expand_tmpfile,	"EXPTMP")		\

	E_(cachefiles_trunc_shrink,		"SHRINK")



#define cachefiles_error_traces						\

	EM(cachefiles_trace_fallocate_error,	"fallocate")		\

	EM(cachefiles_trace_getxattr_error,	"getxattr")		\
@@ -71,6 +99,8 @@ enum cachefiles_error_trace { 
#define EM(a, b) TRACE_DEFINE_ENUM(a);

#define E_(a, b) TRACE_DEFINE_ENUM(a);



cachefiles_obj_kill_traces;

cachefiles_trunc_traces;

cachefiles_error_traces;



/*
@@ -83,6 +113,152 @@ cachefiles_error_traces; 
#define E_(a, b)	{ a, b }





TRACE_EVENT(cachefiles_lookup,

	    TP_PROTO(struct cachefiles_object *obj,

		     struct dentry *de),



	    TP_ARGS(obj, de),



	    TP_STRUCT__entry(

		    __field(unsigned int,		obj	)

		    __field(short,			error	)

		    __field(unsigned long,		ino	)

			     ),



	    TP_fast_assign(

		    __entry->obj	= obj->debug_id;

		    __entry->ino	= (!IS_ERR(de) && d_backing_inode(de) ?

					   d_backing_inode(de)->i_ino : 0);

		    __entry->error	= IS_ERR(de) ? PTR_ERR(de) : 0;

			   ),



	    TP_printk("o=%08x i=%lx e=%d",

		      __entry->obj, __entry->ino, __entry->error)

	    );



TRACE_EVENT(cachefiles_tmpfile,

	    TP_PROTO(struct cachefiles_object *obj, struct inode *backer),



	    TP_ARGS(obj, backer),



	    TP_STRUCT__entry(

		    __field(unsigned int,			obj	)

		    __field(unsigned int,			backer	)

			     ),



	    TP_fast_assign(

		    __entry->obj	= obj->debug_id;

		    __entry->backer	= backer->i_ino;

			   ),



	    TP_printk("o=%08x b=%08x",

		      __entry->obj,

		      __entry->backer)

	    );



TRACE_EVENT(cachefiles_link,

	    TP_PROTO(struct cachefiles_object *obj, struct inode *backer),



	    TP_ARGS(obj, backer),



	    TP_STRUCT__entry(

		    __field(unsigned int,			obj	)

		    __field(unsigned int,			backer	)

			     ),



	    TP_fast_assign(

		    __entry->obj	= obj->debug_id;

		    __entry->backer	= backer->i_ino;

			   ),



	    TP_printk("o=%08x b=%08x",

		      __entry->obj,

		      __entry->backer)

	    );



TRACE_EVENT(cachefiles_unlink,

	    TP_PROTO(struct cachefiles_object *obj,

		     struct dentry *de,

		     enum fscache_why_object_killed why),



	    TP_ARGS(obj, de, why),



	    /* Note that obj may be NULL */

	    TP_STRUCT__entry(

		    __field(unsigned int,		obj		)

		    __field(struct dentry *,		de		)

		    __field(enum fscache_why_object_killed, why		)

			     ),



	    TP_fast_assign(

		    __entry->obj	= obj ? obj->debug_id : UINT_MAX;

		    __entry->de		= de;

		    __entry->why	= why;

			   ),



	    TP_printk("o=%08x d=%p w=%s",

		      __entry->obj, __entry->de,

		      __print_symbolic(__entry->why, cachefiles_obj_kill_traces))

	    );



TRACE_EVENT(cachefiles_rename,

	    TP_PROTO(struct cachefiles_object *obj,

		     struct dentry *de,

		     struct dentry *to,

		     enum fscache_why_object_killed why),



	    TP_ARGS(obj, de, to, why),



	    /* Note that obj may be NULL */

	    TP_STRUCT__entry(

		    __field(unsigned int,		obj		)

		    __field(struct dentry *,		de		)

		    __field(struct dentry *,		to		)

		    __field(enum fscache_why_object_killed, why		)

			     ),



	    TP_fast_assign(

		    __entry->obj	= obj ? obj->debug_id : UINT_MAX;

		    __entry->de		= de;

		    __entry->to		= to;

		    __entry->why	= why;

			   ),



	    TP_printk("o=%08x d=%p t=%p w=%s",

		      __entry->obj, __entry->de, __entry->to,

		      __print_symbolic(__entry->why, cachefiles_obj_kill_traces))

	    );



TRACE_EVENT(cachefiles_trunc,

	    TP_PROTO(struct cachefiles_object *obj, struct inode *backer,

		     loff_t from, loff_t to, enum cachefiles_trunc_trace why),



	    TP_ARGS(obj, backer, from, to, why),



	    TP_STRUCT__entry(

		    __field(unsigned int,			obj	)

		    __field(unsigned int,			backer	)

		    __field(enum cachefiles_trunc_trace,	why	)

		    __field(loff_t,				from	)

		    __field(loff_t,				to	)

			     ),



	    TP_fast_assign(

		    __entry->obj	= obj->debug_id;

		    __entry->backer	= backer->i_ino;

		    __entry->from	= from;

		    __entry->to		= to;

		    __entry->why	= why;

			   ),



	    TP_printk("o=%08x b=%08x %s l=%llx->%llx",

		      __entry->obj,

		      __entry->backer,

		      __print_symbolic(__entry->why, cachefiles_trunc_traces),

		      __entry->from,

		      __entry->to)

	    );



TRACE_EVENT(cachefiles_mark_active,

	    TP_PROTO(struct cachefiles_object *obj,

		     struct inode *inode),