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>
1 parent a24b66c
annotate.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PERF_ANNOTATE_H
#define __PERF_ANNOTATE_H
#include <stdbool.h>
#include <stdint.h>
#include <linux/types.h>
#include "symbol.h"
#include "hist.h"
#include "sort.h"
#include <linux/list.h>
#include <linux/rbtree.h>
#include <pthread.h>
#include <asm/bug.h>
struct ins_ops;
struct ins {
const char *name;
struct ins_ops *ops;
};
struct ins_operands {
char *raw;
char *raw_comment;
struct {
char *raw;
char *name;
struct symbol *sym;
u64 addr;
s64 offset;
bool offset_avail;
bool outside;
} target;
union {
struct {
char *raw;
char *name;
u64 addr;
} source;
struct {
struct ins ins;
struct ins_operands *ops;
} locked;
};
};
struct arch;
struct ins_ops {
void (*free)(struct ins_operands *ops);
int (*parse)(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms);
int (*scnprintf)(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops);
};
bool ins__is_jump(const struct ins *ins);
bool ins__is_call(const struct ins *ins);
bool ins__is_ret(const struct ins *ins);
bool ins__is_lock(const struct ins *ins);
int ins__scnprintf(struct ins *ins, char *bf, size_t size, struct ins_operands *ops);
bool ins__is_fused(struct arch *arch, const char *ins1, const char *ins2);
#define ANNOTATION__IPC_WIDTH 6
#define ANNOTATION__CYCLES_WIDTH 6
#define ANNOTATION__MINMAX_CYCLES_WIDTH 19
struct annotation_options {
bool hide_src_code,
use_offset,
jump_arrows,
print_lines,
full_path,
show_linenr,
show_nr_jumps,
show_nr_samples,
show_total_period,
show_minmax_cycle,
show_asm_raw,
annotate_src;
u8 offset_level;
int min_pcnt;
int max_lines;
int context;
const char *objdump_path;
const char *disassembler_style;
unsigned int percent_type;
};
enum {
ANNOTATION__OFFSET_JUMP_TARGETS = 1,
ANNOTATION__OFFSET_CALL,
ANNOTATION__MAX_OFFSET_LEVEL,
};
#define ANNOTATION__MIN_OFFSET_LEVEL ANNOTATION__OFFSET_JUMP_TARGETS
extern struct annotation_options annotation__default_options;
struct annotation;
struct sym_hist_entry {
u64 nr_samples;
u64 period;
};
enum {
PERCENT_HITS_LOCAL,
PERCENT_HITS_GLOBAL,
PERCENT_PERIOD_LOCAL,
PERCENT_PERIOD_GLOBAL,
PERCENT_MAX,
};
struct annotation_data {
double percent[PERCENT_MAX];
double percent_sum;
struct sym_hist_entry he;
};
struct annotation_line {
struct list_head node;
struct rb_node rb_node;
s64 offset;
char *line;
int line_nr;
int jump_sources;
float ipc;
u64 cycles;
u64 cycles_max;
u64 cycles_min;
size_t privsize;
char *path;
u32 idx;
int idx_asm;
int data_nr;
struct annotation_data data[0];
};
struct disasm_line {
struct ins ins;
struct ins_operands ops;
/* This needs to be at the end. */
struct annotation_line al;
};
static inline double annotation_data__percent(struct annotation_data *data,
unsigned int which)
{
return which < PERCENT_MAX ? data->percent[which] : -1;
}
static inline const char *percent_type_str(unsigned int type)
{
static const char *str[PERCENT_MAX] = {
"local hits",
"global hits",
"local period",
"global period",
};
if (WARN_ON(type >= PERCENT_MAX))
return "N/A";
return str[type];
}
static inline struct disasm_line *disasm_line(struct annotation_line *al)
{
return al ? container_of(al, struct disasm_line, al) : NULL;
}
/*
* Is this offset in the same function as the line it is used?
* asm functions jump to other functions, for instance.
*/
static inline bool disasm_line__has_local_offset(const struct disasm_line *dl)
{
return dl->ops.target.offset_avail && !dl->ops.target.outside;
}
/*
* Can we draw an arrow from the jump to its target, for instance? I.e.
* is the jump and its target in the same function?
*/
bool disasm_line__is_valid_local_jump(struct disasm_line *dl, struct symbol *sym);
void disasm_line__free(struct disasm_line *dl);
struct annotation_line *
annotation_line__next(struct annotation_line *pos, struct list_head *head);
struct annotation_write_ops {
bool first_line, current_entry, change_color;
int width;
void *obj;
int (*set_color)(void *obj, int color);
void (*set_percent_color)(void *obj, double percent, bool current);
int (*set_jumps_percent_color)(void *obj, int nr, bool current);
void (*printf)(void *obj, const char *fmt, ...);
void (*write_graph)(void *obj, int graph);
};
void annotation_line__write(struct annotation_line *al, struct annotation *notes,
struct annotation_write_ops *ops,
struct annotation_options *opts);
int __annotation__scnprintf_samples_period(struct annotation *notes,
char *bf, size_t size,
struct perf_evsel *evsel,
bool show_freq);
int disasm_line__scnprintf(struct disasm_line *dl, char *bf, size_t size, bool raw);
size_t disasm__fprintf(struct list_head *head, FILE *fp);
void symbol__calc_percent(struct symbol *sym, struct perf_evsel *evsel);
struct sym_hist {
u64 nr_samples;
u64 period;
struct sym_hist_entry addr[0];
};
struct cyc_hist {
u64 start;
u64 cycles;
u64 cycles_aggr;
u64 cycles_max;
u64 cycles_min;
u32 num;
u32 num_aggr;
u8 have_start;
/* 1 byte padding */
u16 reset;
};
/** struct annotated_source - symbols with hits have this attached as in sannotation
*
* @histograms: Array of addr hit histograms per event being monitored
* nr_histograms: This may not be the same as evsel->evlist->nr_entries if
* we have more than a group in a evlist, where we will want
* to see each group separately, that is why symbol__annotate2()
* sets src->nr_histograms to evsel->nr_members.
* @lines: If 'print_lines' is specified, per source code line percentages
* @source: source parsed from a disassembler like objdump -dS
* @cyc_hist: Average cycles per basic block
*
* lines is allocated, percentages calculated and all sorted by percentage
* when the annotation is about to be presented, so the percentages are for
* one of the entries in the histogram array, i.e. for the event/counter being
* presented. It is deallocated right after symbol__{tui,tty,etc}_annotate
* returns.
*/
struct annotated_source {
struct list_head source;
int nr_histograms;
size_t sizeof_sym_hist;
struct cyc_hist *cycles_hist;
struct sym_hist *histograms;
};
struct annotation {
pthread_mutex_t lock;
u64 max_coverage;
u64 start;
struct annotation_options *options;
struct annotation_line **offsets;
int nr_events;
int nr_jumps;
int max_jump_sources;
int nr_entries;
int nr_asm_entries;
u16 max_line_len;
struct {
u8 addr;
u8 jumps;
u8 target;
u8 min_addr;
u8 max_addr;
} widths;
bool have_cycles;
struct annotated_source *src;
};
static inline int annotation__cycles_width(struct annotation *notes)
{
if (notes->have_cycles && notes->options->show_minmax_cycle)
return ANNOTATION__IPC_WIDTH + ANNOTATION__MINMAX_CYCLES_WIDTH;
return notes->have_cycles ? ANNOTATION__IPC_WIDTH + ANNOTATION__CYCLES_WIDTH : 0;
}
static inline int annotation__pcnt_width(struct annotation *notes)
{
return (notes->options->show_total_period ? 12 : 7) * notes->nr_events;
}
static inline bool annotation_line__filter(struct annotation_line *al, struct annotation *notes)
{
return notes->options->hide_src_code && al->offset == -1;
}
void annotation__set_offsets(struct annotation *notes, s64 size);
void annotation__compute_ipc(struct annotation *notes, size_t size);
void annotation__mark_jump_targets(struct annotation *notes, struct symbol *sym);
void annotation__update_column_widths(struct annotation *notes);
void annotation__init_column_widths(struct annotation *notes, struct symbol *sym);
static inline struct sym_hist *annotated_source__histogram(struct annotated_source *src, int idx)
{
return ((void *)src->histograms) + (src->sizeof_sym_hist * idx);
}
static inline struct sym_hist *annotation__histogram(struct annotation *notes, int idx)
{
return annotated_source__histogram(notes->src, idx);
}
static inline struct annotation *symbol__annotation(struct symbol *sym)
{
return (void *)sym - symbol_conf.priv_size;
}
int addr_map_symbol__inc_samples(struct addr_map_symbol *ams, struct perf_sample *sample,
struct perf_evsel *evsel);
int addr_map_symbol__account_cycles(struct addr_map_symbol *ams,
struct addr_map_symbol *start,
unsigned cycles);
int hist_entry__inc_addr_samples(struct hist_entry *he, struct perf_sample *sample,
struct perf_evsel *evsel, u64 addr);
struct annotated_source *symbol__hists(struct symbol *sym, int nr_hists);
void symbol__annotate_zero_histograms(struct symbol *sym);
int symbol__annotate(struct symbol *sym, struct map *map,
struct perf_evsel *evsel, size_t privsize,
struct annotation_options *options,
struct arch **parch);
int symbol__annotate2(struct symbol *sym, struct map *map,
struct perf_evsel *evsel,
struct annotation_options *options,
struct arch **parch);
enum symbol_disassemble_errno {
SYMBOL_ANNOTATE_ERRNO__SUCCESS = 0,
/*
* Choose an arbitrary negative big number not to clash with standard
* errno since SUS requires the errno has distinct positive values.
* See 'Issue 6' in the link below.
*
* http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
*/
__SYMBOL_ANNOTATE_ERRNO__START = -10000,
SYMBOL_ANNOTATE_ERRNO__NO_VMLINUX = __SYMBOL_ANNOTATE_ERRNO__START,
__SYMBOL_ANNOTATE_ERRNO__END,
};
int symbol__strerror_disassemble(struct symbol *sym, struct map *map,
int errnum, char *buf, size_t buflen);
int symbol__annotate_printf(struct symbol *sym, struct map *map,
struct perf_evsel *evsel,
struct annotation_options *options);
void symbol__annotate_zero_histogram(struct symbol *sym, int evidx);
void symbol__annotate_decay_histogram(struct symbol *sym, int evidx);
void annotated_source__purge(struct annotated_source *as);
int map_symbol__annotation_dump(struct map_symbol *ms, struct perf_evsel *evsel,
struct annotation_options *opts);
bool ui__has_annotation(void);
int symbol__tty_annotate(struct symbol *sym, struct map *map,
struct perf_evsel *evsel, struct annotation_options *opts);
int symbol__tty_annotate2(struct symbol *sym, struct map *map,
struct perf_evsel *evsel, struct annotation_options *opts);
#ifdef HAVE_SLANG_SUPPORT
int symbol__tui_annotate(struct symbol *sym, struct map *map,
struct perf_evsel *evsel,
struct hist_browser_timer *hbt,
struct annotation_options *opts);
#else
static inline int symbol__tui_annotate(struct symbol *sym __maybe_unused,
struct map *map __maybe_unused,
struct perf_evsel *evsel __maybe_unused,
struct hist_browser_timer *hbt __maybe_unused,
struct annotation_options *opts __maybe_unused)
{
return 0;
}
#endif
void annotation_config__init(void);
int annotate_parse_percent_type(const struct option *opt, const char *_str,
int unset);
#endif /* __PERF_ANNOTATE_H */
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