Revision 9c29bcd189f4ab1644b7125713602532d0aefdb7 authored by Eric Dumazet on 21 September 2018, 22:27:48 UTC, committed by David S. Miller on 24 September 2018, 04:55:25 UTC
As diagnosed by Song Liu, ndo_poll_controller() can be very dangerous on loaded hosts, since the cpu calling ndo_poll_controller() might steal all NAPI contexts (for all RX/TX queues of the NIC). This capture can last for unlimited amount of time, since one cpu is generally not able to drain all the queues under load. mlx5 uses NAPI for TX completions, so we better let core networking stack call the napi->poll() to avoid the capture. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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trace-event.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PERF_UTIL_TRACE_EVENT_H
#define _PERF_UTIL_TRACE_EVENT_H
#include <traceevent/event-parse.h>
#include "parse-events.h"
struct machine;
struct perf_sample;
union perf_event;
struct perf_tool;
struct thread;
struct plugin_list;
struct trace_event {
struct tep_handle *pevent;
struct plugin_list *plugin_list;
};
int trace_event__init(struct trace_event *t);
void trace_event__cleanup(struct trace_event *t);
int trace_event__register_resolver(struct machine *machine,
tep_func_resolver_t *func);
struct event_format*
trace_event__tp_format(const char *sys, const char *name);
struct event_format *trace_event__tp_format_id(int id);
int bigendian(void);
void event_format__fprintf(struct event_format *event,
int cpu, void *data, int size, FILE *fp);
void event_format__print(struct event_format *event,
int cpu, void *data, int size);
int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size);
int parse_event_file(struct tep_handle *pevent,
char *buf, unsigned long size, char *sys);
unsigned long long
raw_field_value(struct event_format *event, const char *name, void *data);
void parse_proc_kallsyms(struct tep_handle *pevent, char *file, unsigned int size);
void parse_ftrace_printk(struct tep_handle *pevent, char *file, unsigned int size);
void parse_saved_cmdline(struct tep_handle *pevent, char *file, unsigned int size);
ssize_t trace_report(int fd, struct trace_event *tevent, bool repipe);
struct event_format *trace_find_next_event(struct tep_handle *pevent,
struct event_format *event);
unsigned long long read_size(struct event_format *event, void *ptr, int size);
unsigned long long eval_flag(const char *flag);
int read_tracing_data(int fd, struct list_head *pattrs);
struct tracing_data {
/* size is only valid if temp is 'true' */
ssize_t size;
bool temp;
char temp_file[50];
};
struct tracing_data *tracing_data_get(struct list_head *pattrs,
int fd, bool temp);
int tracing_data_put(struct tracing_data *tdata);
struct addr_location;
struct perf_session;
struct perf_stat_config;
struct scripting_ops {
const char *name;
int (*start_script) (const char *script, int argc, const char **argv);
int (*flush_script) (void);
int (*stop_script) (void);
void (*process_event) (union perf_event *event,
struct perf_sample *sample,
struct perf_evsel *evsel,
struct addr_location *al);
void (*process_stat)(struct perf_stat_config *config,
struct perf_evsel *evsel, u64 tstamp);
void (*process_stat_interval)(u64 tstamp);
int (*generate_script) (struct tep_handle *pevent, const char *outfile);
};
extern unsigned int scripting_max_stack;
int script_spec_register(const char *spec, struct scripting_ops *ops);
void setup_perl_scripting(void);
void setup_python_scripting(void);
struct scripting_context {
struct tep_handle *pevent;
void *event_data;
};
int common_pc(struct scripting_context *context);
int common_flags(struct scripting_context *context);
int common_lock_depth(struct scripting_context *context);
#endif /* _PERF_UTIL_TRACE_EVENT_H */
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