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Tracing updates for 5.14:

Browse source 
- Added option for per CPU threads to the hwlat tracer
 
  - Have hwlat tracer handle hotplug CPUs
 
  - New tracer: osnoise, that detects latency caused by interrupts, softirqs
    and scheduling of other tasks.
 
  - Added timerlat tracer that creates a thread and measures in detail what
    sources of latency it has for wake ups.
 
  - Removed the "success" field of the sched_wakeup trace event.
    This has been hardcoded as "1" since 2015, no tooling should be looking
    at it now. If one exists, we can revert this commit, fix that tool and
    try to remove it again in the future.
 
  - tgid mapping fixed to handle more than PID_MAX_DEFAULT pids/tgids.
 
  - New boot command line option "tp_printk_stop", as tp_printk causes trace
    events to write to console. When user space starts, this can easily live
    lock the system. Having a boot option to stop just after boot up is
    useful to prevent that from happening.
 
  - Have ftrace_dump_on_oops boot command line option take numbers that match
    the numbers shown in /proc/sys/kernel/ftrace_dump_on_oops.
 
  - Bootconfig clean ups, fixes and enhancements.
 
  - New ktest script that tests bootconfig options.
 
  - Add tracepoint_probe_register_may_exist() to register a tracepoint
    without triggering a WARN*() if it already exists. BPF has a path from
    user space that can do this. All other paths are considered a bug.
 
  - Small clean ups and fixes
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Merge tag 'trace-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing updates from Steven Rostedt:

 - Added option for per CPU threads to the hwlat tracer

 - Have hwlat tracer handle hotplug CPUs

 - New tracer: osnoise, that detects latency caused by interrupts,
   softirqs and scheduling of other tasks.

 - Added timerlat tracer that creates a thread and measures in detail
   what sources of latency it has for wake ups.

 - Removed the "success" field of the sched_wakeup trace event. This has
   been hardcoded as "1" since 2015, no tooling should be looking at it
   now. If one exists, we can revert this commit, fix that tool and try
   to remove it again in the future.

 - tgid mapping fixed to handle more than PID_MAX_DEFAULT pids/tgids.

 - New boot command line option "tp_printk_stop", as tp_printk causes
   trace events to write to console. When user space starts, this can
   easily live lock the system. Having a boot option to stop just after
   boot up is useful to prevent that from happening.

 - Have ftrace_dump_on_oops boot command line option take numbers that
   match the numbers shown in /proc/sys/kernel/ftrace_dump_on_oops.

 - Bootconfig clean ups, fixes and enhancements.

 - New ktest script that tests bootconfig options.

 - Add tracepoint_probe_register_may_exist() to register a tracepoint
   without triggering a WARN*() if it already exists. BPF has a path
   from user space that can do this. All other paths are considered a
   bug.

 - Small clean ups and fixes

* tag 'trace-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (49 commits)
  tracing: Resize tgid_map to pid_max, not PID_MAX_DEFAULT
  tracing: Simplify & fix saved_tgids logic
  treewide: Add missing semicolons to __assign_str uses
  tracing: Change variable type as bool for clean-up
  trace/timerlat: Fix indentation on timerlat_main()
  trace/osnoise: Make 'noise' variable s64 in run_osnoise()
  tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing
  tracing: Fix spelling in osnoise tracer "interferences" -> "interference"
  Documentation: Fix a typo on trace/osnoise-tracer
  trace/osnoise: Fix return value on osnoise_init_hotplug_support
  trace/osnoise: Make interval u64 on osnoise_main
  trace/osnoise: Fix 'no previous prototype' warnings
  tracing: Have osnoise_main() add a quiescent state for task rcu
  seq_buf: Make trace_seq_putmem_hex() support data longer than 8
  seq_buf: Fix overflow in seq_buf_putmem_hex()
  trace/osnoise: Support hotplug operations
  trace/hwlat: Support hotplug operations
  trace/hwlat: Protect kdata->kthread with get/put_online_cpus
  trace: Add timerlat tracer
  trace: Add osnoise tracer
  ...
This commit is contained in:
Linus Torvalds 2021-07-03 11:13:22 -07:00
commit 757fa80f4e
74 changed files with 4464 additions and 394 deletions
Download patch file Download diff file Expand all files Collapse all files

58
include/linux/bootconfig.h
View file

@ -16,6 +16,26 @@
#define BOOTCONFIG_ALIGN (1 << BOOTCONFIG_ALIGN_SHIFT)
#define BOOTCONFIG_ALIGN_MASK (BOOTCONFIG_ALIGN - 1)
/**
* xbc_calc_checksum() - Calculate checksum of bootconfig
* @data: Bootconfig data.
* @size: The size of the bootconfig data.
*
* Calculate the checksum value of the bootconfig data.
* The checksum will be used with the BOOTCONFIG_MAGIC and the size for
* embedding the bootconfig in the initrd image.
*/
static inline __init u32 xbc_calc_checksum(void *data, u32 size)
{
unsigned char *p = data;
u32 ret = 0;
while (size--)
ret += *p++;
return ret;
}
/* XBC tree node */
struct xbc_node {
u16 next;
@ -71,7 +91,7 @@ static inline __init bool xbc_node_is_key(struct xbc_node *node)
*/
static inline __init bool xbc_node_is_array(struct xbc_node *node)
{
return xbc_node_is_value(node) && node->next != 0;
return xbc_node_is_value(node) && node->child != 0;
}
/**
@ -80,6 +100,8 @@ static inline __init bool xbc_node_is_array(struct xbc_node *node)
*
* Test the @node is a leaf key node which is a key node and has a value node
* or no child. Returns true if it is a leaf node, or false if not.
* Note that the leaf node can have subkey nodes in addition to the
* value node.
*/
static inline __init bool xbc_node_is_leaf(struct xbc_node *node)
{
@ -129,6 +151,23 @@ static inline struct xbc_node * __init xbc_find_node(const char *key)
return xbc_node_find_child(NULL, key);
}
/**
* xbc_node_get_subkey() - Return the first subkey node if exists
* @node: Parent node
*
* Return the first subkey node of the @node. If the @node has no child
* or only value node, this will return NULL.
*/
static inline struct xbc_node * __init xbc_node_get_subkey(struct xbc_node *node)
{
struct xbc_node *child = xbc_node_get_child(node);
if (child && xbc_node_is_value(child))
return xbc_node_get_next(child);
else
return child;
}
/**
* xbc_array_for_each_value() - Iterate value nodes on an array
* @anode: An XBC arraied value node
@ -140,7 +179,7 @@ static inline struct xbc_node * __init xbc_find_node(const char *key)
*/
#define xbc_array_for_each_value(anode, value) \
for (value = xbc_node_get_data(anode); anode != NULL ; \
anode = xbc_node_get_next(anode), \
anode = xbc_node_get_child(anode), \
value = anode ? xbc_node_get_data(anode) : NULL)
/**
@ -149,11 +188,24 @@ static inline struct xbc_node * __init xbc_find_node(const char *key)
* @child: Iterated XBC node.
*
* Iterate child nodes of @parent. Each child nodes are stored to @child.
* The @child can be mixture of a value node and subkey nodes.
*/
#define xbc_node_for_each_child(parent, child) \
for (child = xbc_node_get_child(parent); child != NULL ; \
child = xbc_node_get_next(child))
/**
* xbc_node_for_each_subkey() - Iterate child subkey nodes
* @parent: An XBC node.
* @child: Iterated XBC node.
*
* Iterate subkey nodes of @parent. Each child nodes are stored to @child.
* The @child is only the subkey node.
*/
#define xbc_node_for_each_subkey(parent, child) \
for (child = xbc_node_get_subkey(parent); child != NULL ; \
child = xbc_node_get_next(child))
/**
* xbc_node_for_each_array_value() - Iterate array entries of geven key
* @node: An XBC node.
@ -171,7 +223,7 @@ static inline struct xbc_node * __init xbc_find_node(const char *key)
*/
#define xbc_node_for_each_array_value(node, key, anode, value) \
for (value = xbc_node_find_value(node, key, &anode); value != NULL; \
anode = xbc_node_get_next(anode), \
anode = xbc_node_get_child(anode), \
value = anode ? xbc_node_get_data(anode) : NULL)
/**

13
include/linux/ftrace_irq.h
View file

@ -7,12 +7,21 @@ extern bool trace_hwlat_callback_enabled;
extern void trace_hwlat_callback(bool enter);
#endif
#ifdef CONFIG_OSNOISE_TRACER
extern bool trace_osnoise_callback_enabled;
extern void trace_osnoise_callback(bool enter);
#endif
static inline void ftrace_nmi_enter(void)
{
#ifdef CONFIG_HWLAT_TRACER
if (trace_hwlat_callback_enabled)
trace_hwlat_callback(true);
#endif
#ifdef CONFIG_OSNOISE_TRACER
if (trace_osnoise_callback_enabled)
trace_osnoise_callback(true);
#endif
}
static inline void ftrace_nmi_exit(void)
@ -21,6 +30,10 @@ static inline void ftrace_nmi_exit(void)
if (trace_hwlat_callback_enabled)
trace_hwlat_callback(false);
#endif
#ifdef CONFIG_OSNOISE_TRACER
if (trace_osnoise_callback_enabled)
trace_osnoise_callback(false);
#endif
}
#endif /* _LINUX_FTRACE_IRQ_H */

7
include/linux/trace.h
View file

@ -41,6 +41,13 @@ int trace_array_init_printk(struct trace_array *tr);
void trace_array_put(struct trace_array *tr);
struct trace_array *trace_array_get_by_name(const char *name);
int trace_array_destroy(struct trace_array *tr);
/* For osnoise tracer */
int osnoise_arch_register(void);
void osnoise_arch_unregister(void);
void osnoise_trace_irq_entry(int id);
void osnoise_trace_irq_exit(int id, const char *desc);
#endif /* CONFIG_TRACING */
#endif /* _LINUX_TRACE_H */

10
include/linux/tracepoint.h
View file

@ -41,7 +41,17 @@ extern int
tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, void *data,
int prio);
extern int
tracepoint_probe_register_prio_may_exist(struct tracepoint *tp, void *probe, void *data,
int prio);
extern int
tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data);
static inline int
tracepoint_probe_register_may_exist(struct tracepoint *tp, void *probe,
void *data)
{
return tracepoint_probe_register_prio_may_exist(tp, probe, data,
TRACEPOINT_DEFAULT_PRIO);
}
extern void
for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
void *priv);