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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: David Howells <[email protected]> Reviewed-by: Jeff Layton <[email protected]> cc: [email protected] 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
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‎include/trace/events/cachefiles.h

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Original file line numberDiff line numberDiff line change
@@ -18,6 +18,21 @@
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#ifndef __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
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#define __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
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enum fscache_why_object_killed {
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FSCACHE_OBJECT_IS_STALE,
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FSCACHE_OBJECT_IS_WEIRD,
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FSCACHE_OBJECT_INVALIDATED,
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FSCACHE_OBJECT_NO_SPACE,
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FSCACHE_OBJECT_WAS_RETIRED,
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FSCACHE_OBJECT_WAS_CULLED,
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};
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enum cachefiles_trunc_trace {
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cachefiles_trunc_dio_adjust,
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cachefiles_trunc_expand_tmpfile,
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cachefiles_trunc_shrink,
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};
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2136
enum cachefiles_error_trace {
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cachefiles_trace_fallocate_error,
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cachefiles_trace_getxattr_error,
@@ -43,6 +58,19 @@ enum cachefiles_error_trace {
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/*
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* Define enum -> string mappings for display.
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*/
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#define cachefiles_obj_kill_traces \
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EM(FSCACHE_OBJECT_IS_STALE, "stale") \
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EM(FSCACHE_OBJECT_IS_WEIRD, "weird") \
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EM(FSCACHE_OBJECT_INVALIDATED, "inval") \
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EM(FSCACHE_OBJECT_NO_SPACE, "no_space") \
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EM(FSCACHE_OBJECT_WAS_RETIRED, "was_retired") \
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E_(FSCACHE_OBJECT_WAS_CULLED, "was_culled")
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#define cachefiles_trunc_traces \
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EM(cachefiles_trunc_dio_adjust, "DIOADJ") \
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EM(cachefiles_trunc_expand_tmpfile, "EXPTMP") \
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E_(cachefiles_trunc_shrink, "SHRINK")
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#define cachefiles_error_traces \
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EM(cachefiles_trace_fallocate_error, "fallocate") \
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EM(cachefiles_trace_getxattr_error, "getxattr") \
@@ -71,6 +99,8 @@ enum cachefiles_error_trace {
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#define EM(a, b) TRACE_DEFINE_ENUM(a);
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#define E_(a, b) TRACE_DEFINE_ENUM(a);
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cachefiles_obj_kill_traces;
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cachefiles_trunc_traces;
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cachefiles_error_traces;
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/*
@@ -83,6 +113,152 @@ cachefiles_error_traces;
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#define E_(a, b) { a, b }
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TRACE_EVENT(cachefiles_lookup,
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TP_PROTO(struct cachefiles_object *obj,
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struct dentry *de),
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TP_ARGS(obj, de),
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TP_STRUCT__entry(
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__field(unsigned int, obj )
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__field(short, error )
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__field(unsigned long, ino )
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),
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TP_fast_assign(
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__entry->obj = obj->debug_id;
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__entry->ino = (!IS_ERR(de) && d_backing_inode(de) ?
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d_backing_inode(de)->i_ino : 0);
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__entry->error = IS_ERR(de) ? PTR_ERR(de) : 0;
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),
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TP_printk("o=%08x i=%lx e=%d",
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__entry->obj, __entry->ino, __entry->error)
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);
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TRACE_EVENT(cachefiles_tmpfile,
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TP_PROTO(struct cachefiles_object *obj, struct inode *backer),
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TP_ARGS(obj, backer),
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TP_STRUCT__entry(
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__field(unsigned int, obj )
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__field(unsigned int, backer )
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),
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TP_fast_assign(
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__entry->obj = obj->debug_id;
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__entry->backer = backer->i_ino;
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),
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TP_printk("o=%08x b=%08x",
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__entry->obj,
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__entry->backer)
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);
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TRACE_EVENT(cachefiles_link,
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TP_PROTO(struct cachefiles_object *obj, struct inode *backer),
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TP_ARGS(obj, backer),
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TP_STRUCT__entry(
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__field(unsigned int, obj )
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__field(unsigned int, backer )
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),
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TP_fast_assign(
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__entry->obj = obj->debug_id;
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__entry->backer = backer->i_ino;
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),
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TP_printk("o=%08x b=%08x",
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__entry->obj,
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__entry->backer)
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);
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TRACE_EVENT(cachefiles_unlink,
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TP_PROTO(struct cachefiles_object *obj,
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struct dentry *de,
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enum fscache_why_object_killed why),
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TP_ARGS(obj, de, why),
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/* Note that obj may be NULL */
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TP_STRUCT__entry(
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__field(unsigned int, obj )
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__field(struct dentry *, de )
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__field(enum fscache_why_object_killed, why )
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),
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TP_fast_assign(
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__entry->obj = obj ? obj->debug_id : UINT_MAX;
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__entry->de = de;
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__entry->why = why;
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),
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TP_printk("o=%08x d=%p w=%s",
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__entry->obj, __entry->de,
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__print_symbolic(__entry->why, cachefiles_obj_kill_traces))
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);
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TRACE_EVENT(cachefiles_rename,
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TP_PROTO(struct cachefiles_object *obj,
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struct dentry *de,
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struct dentry *to,
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enum fscache_why_object_killed why),
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TP_ARGS(obj, de, to, why),
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/* Note that obj may be NULL */
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TP_STRUCT__entry(
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__field(unsigned int, obj )
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__field(struct dentry *, de )
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__field(struct dentry *, to )
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__field(enum fscache_why_object_killed, why )
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),
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TP_fast_assign(
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__entry->obj = obj ? obj->debug_id : UINT_MAX;
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__entry->de = de;
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__entry->to = to;
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__entry->why = why;
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),
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TP_printk("o=%08x d=%p t=%p w=%s",
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__entry->obj, __entry->de, __entry->to,
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__print_symbolic(__entry->why, cachefiles_obj_kill_traces))
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);
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TRACE_EVENT(cachefiles_trunc,
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TP_PROTO(struct cachefiles_object *obj, struct inode *backer,
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loff_t from, loff_t to, enum cachefiles_trunc_trace why),
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TP_ARGS(obj, backer, from, to, why),
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TP_STRUCT__entry(
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__field(unsigned int, obj )
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__field(unsigned int, backer )
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__field(enum cachefiles_trunc_trace, why )
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__field(loff_t, from )
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__field(loff_t, to )
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),
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TP_fast_assign(
247+
__entry->obj = obj->debug_id;
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__entry->backer = backer->i_ino;
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__entry->from = from;
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__entry->to = to;
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__entry->why = why;
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),
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TP_printk("o=%08x b=%08x %s l=%llx->%llx",
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__entry->obj,
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__entry->backer,
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__print_symbolic(__entry->why, cachefiles_trunc_traces),
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__entry->from,
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__entry->to)
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);
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86262
TRACE_EVENT(cachefiles_mark_active,
87263
TP_PROTO(struct cachefiles_object *obj,
88264
struct inode *inode),

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