From a18feb55769b705a44c4107786c4045eae2e87b6 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 4 Apr 2018 13:41:27 +0100 Subject: fscache: Add tracepoints Add some tracepoints to fscache: (*) fscache_cookie - Tracks a cookie's usage count. (*) fscache_netfs - Logs registration of a network filesystem, including the pointer to the cookie allocated. (*) fscache_acquire - Logs cookie acquisition. (*) fscache_relinquish - Logs cookie relinquishment. (*) fscache_enable - Logs enablement of a cookie. (*) fscache_disable - Logs disablement of a cookie. (*) fscache_osm - Tracks execution of states in the object state machine. and cachefiles: (*) cachefiles_ref - Tracks a cachefiles object's usage count. (*) cachefiles_lookup - Logs result of lookup_one_len(). (*) cachefiles_mkdir - Logs result of vfs_mkdir(). (*) cachefiles_create - Logs result of vfs_create(). (*) cachefiles_unlink - Logs calls to vfs_unlink(). (*) cachefiles_rename - Logs calls to vfs_rename(). (*) cachefiles_mark_active - Logs an object becoming active. (*) cachefiles_wait_active - Logs a wait for an old object to be destroyed. (*) cachefiles_mark_inactive - Logs an object becoming inactive. (*) cachefiles_mark_buried - Logs the burial of an object. Signed-off-by: David Howells --- include/trace/events/fscache.h | 277 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 277 insertions(+) create mode 100644 include/trace/events/fscache.h (limited to 'include/trace/events/fscache.h') diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h new file mode 100644 index 000000000000..99f5355d6281 --- /dev/null +++ b/include/trace/events/fscache.h @@ -0,0 +1,277 @@ +/* FS-Cache tracepoints + * + * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM fscache + +#if !defined(_TRACE_FSCACHE_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_FSCACHE_H + +#include +#include + +/* + * Define enums for tracing information. + */ +#ifndef __FSCACHE_DECLARE_TRACE_ENUMS_ONCE_ONLY +#define __FSCACHE_DECLARE_TRACE_ENUMS_ONCE_ONLY + +enum fscache_cookie_trace { + fscache_cookie_get_acquire_parent, + fscache_cookie_get_attach_object, + fscache_cookie_get_register_netfs, + fscache_cookie_put_acquire_nobufs, + fscache_cookie_put_relinquish, + fscache_cookie_put_object, + fscache_cookie_put_parent, +}; + +#endif + +/* + * Declare tracing information enums and their string mappings for display. + */ +#define fscache_cookie_traces \ + EM(fscache_cookie_get_acquire_parent, "GET prn") \ + EM(fscache_cookie_get_attach_object, "GET obj") \ + EM(fscache_cookie_get_register_netfs, "GET net") \ + EM(fscache_cookie_put_acquire_nobufs, "PUT nbf") \ + EM(fscache_cookie_put_relinquish, "PUT rlq") \ + EM(fscache_cookie_put_object, "PUT obj") \ + E_(fscache_cookie_put_parent, "PUT prn") + +/* + * Export enum symbols via userspace. + */ +#undef EM +#undef E_ +#define EM(a, b) TRACE_DEFINE_ENUM(a); +#define E_(a, b) TRACE_DEFINE_ENUM(a); + +fscache_cookie_traces; + +/* + * Now redefine the EM() and E_() macros to map the enums to the strings that + * will be printed in the output. + */ +#undef EM +#undef E_ +#define EM(a, b) { a, b }, +#define E_(a, b) { a, b } + + +TRACE_EVENT(fscache_cookie, + TP_PROTO(struct fscache_cookie *cookie, + enum fscache_cookie_trace where, + int usage), + + TP_ARGS(cookie, where, usage), + + TP_STRUCT__entry( + __field(struct fscache_cookie *, cookie ) + __field(struct fscache_cookie *, parent ) + __field(enum fscache_cookie_trace, where ) + __field(int, usage ) + __field(int, n_children ) + __field(int, n_active ) + __field(u8, flags ) + ), + + TP_fast_assign( + __entry->cookie = cookie; + __entry->parent = cookie->parent; + __entry->where = where; + __entry->usage = usage; + __entry->n_children = atomic_read(&cookie->n_children); + __entry->n_active = atomic_read(&cookie->n_active); + __entry->flags = cookie->flags; + ), + + TP_printk("%s c=%p u=%d p=%p Nc=%d Na=%d f=%02x", + __print_symbolic(__entry->where, fscache_cookie_traces), + __entry->cookie, __entry->usage, + __entry->parent, __entry->n_children, __entry->n_active, + __entry->flags) + ); + +TRACE_EVENT(fscache_netfs, + TP_PROTO(struct fscache_netfs *netfs), + + TP_ARGS(netfs), + + TP_STRUCT__entry( + __field(struct fscache_cookie *, cookie ) + __array(char, name, 8 ) + ), + + TP_fast_assign( + __entry->cookie = netfs->primary_index; + strncpy(__entry->name, netfs->name, 8); + __entry->name[7] = 0; + ), + + TP_printk("c=%p n=%s", + __entry->cookie, __entry->name) + ); + +TRACE_EVENT(fscache_acquire, + TP_PROTO(struct fscache_cookie *cookie), + + TP_ARGS(cookie), + + TP_STRUCT__entry( + __field(struct fscache_cookie *, cookie ) + __field(struct fscache_cookie *, parent ) + __array(char, name, 8 ) + __field(int, p_usage ) + __field(int, p_n_children ) + __field(u8, p_flags ) + ), + + TP_fast_assign( + __entry->cookie = cookie; + __entry->parent = cookie->parent; + __entry->p_usage = atomic_read(&cookie->parent->usage); + __entry->p_n_children = atomic_read(&cookie->parent->n_children); + __entry->p_flags = cookie->parent->flags; + memcpy(__entry->name, cookie->def->name, 8); + __entry->name[7] = 0; + ), + + TP_printk("c=%p p=%p pu=%d pc=%d pf=%02x n=%s", + __entry->cookie, __entry->parent, __entry->p_usage, + __entry->p_n_children, __entry->p_flags, __entry->name) + ); + +TRACE_EVENT(fscache_relinquish, + TP_PROTO(struct fscache_cookie *cookie, bool retire), + + TP_ARGS(cookie, retire), + + TP_STRUCT__entry( + __field(struct fscache_cookie *, cookie ) + __field(struct fscache_cookie *, parent ) + __field(int, usage ) + __field(int, n_children ) + __field(int, n_active ) + __field(u8, flags ) + __field(bool, retire ) + ), + + TP_fast_assign( + __entry->cookie = cookie; + __entry->parent = cookie->parent; + __entry->usage = atomic_read(&cookie->usage); + __entry->n_children = atomic_read(&cookie->n_children); + __entry->n_active = atomic_read(&cookie->n_active); + __entry->flags = cookie->flags; + __entry->retire = retire; + ), + + TP_printk("c=%p u=%d p=%p Nc=%d Na=%d f=%02x r=%u", + __entry->cookie, __entry->usage, + __entry->parent, __entry->n_children, __entry->n_active, + __entry->flags, __entry->retire) + ); + +TRACE_EVENT(fscache_enable, + TP_PROTO(struct fscache_cookie *cookie), + + TP_ARGS(cookie), + + TP_STRUCT__entry( + __field(struct fscache_cookie *, cookie ) + __field(int, usage ) + __field(int, n_children ) + __field(int, n_active ) + __field(u8, flags ) + ), + + TP_fast_assign( + __entry->cookie = cookie; + __entry->usage = atomic_read(&cookie->usage); + __entry->n_children = atomic_read(&cookie->n_children); + __entry->n_active = atomic_read(&cookie->n_active); + __entry->flags = cookie->flags; + ), + + TP_printk("c=%p u=%d Nc=%d Na=%d f=%02x", + __entry->cookie, __entry->usage, + __entry->n_children, __entry->n_active, __entry->flags) + ); + +TRACE_EVENT(fscache_disable, + TP_PROTO(struct fscache_cookie *cookie), + + TP_ARGS(cookie), + + TP_STRUCT__entry( + __field(struct fscache_cookie *, cookie ) + __field(int, usage ) + __field(int, n_children ) + __field(int, n_active ) + __field(u8, flags ) + ), + + TP_fast_assign( + __entry->cookie = cookie; + __entry->usage = atomic_read(&cookie->usage); + __entry->n_children = atomic_read(&cookie->n_children); + __entry->n_active = atomic_read(&cookie->n_active); + __entry->flags = cookie->flags; + ), + + TP_printk("c=%p u=%d Nc=%d Na=%d f=%02x", + __entry->cookie, __entry->usage, + __entry->n_children, __entry->n_active, __entry->flags) + ); + +TRACE_EVENT(fscache_osm, + TP_PROTO(struct fscache_object *object, + const struct fscache_state *state, + bool wait, bool oob, s8 event_num), + + TP_ARGS(object, state, wait, oob, event_num), + + TP_STRUCT__entry( + __field(struct fscache_cookie *, cookie ) + __field(struct fscache_object *, object ) + __array(char, state, 8 ) + __field(bool, wait ) + __field(bool, oob ) + __field(s8, event_num ) + ), + + TP_fast_assign( + __entry->cookie = object->cookie; + __entry->object = object; + __entry->wait = wait; + __entry->oob = oob; + __entry->event_num = event_num; + memcpy(__entry->state, state->short_name, 8); + ), + + TP_printk("c=%p o=%p %s %s%sev=%d", + __entry->cookie, + __entry->object, + __entry->state, + __print_symbolic(__entry->wait, + { true, "WAIT" }, + { false, "WORK" }), + __print_symbolic(__entry->oob, + { true, " OOB " }, + { false, " " }), + __entry->event_num) + ); + +#endif /* _TRACE_FSCACHE_H */ + +/* This part must be outside protection */ +#include -- cgit v1.2.3