linux/tools/perf/util/header.h
Arnaldo Carvalho de Melo 3ba4d2e1a8 perf header: Pack 'struct perf_session_env'
Initial struct:

[acme@ssdandy linux]$ pahole -C perf_session_env ~/bin/perf
struct perf_session_env {
	char *                     hostname;             /*     0     8 */
	char *                     os_release;           /*     8     8 */
	char *                     version;              /*    16     8 */
	char *                     arch;                 /*    24     8 */
	int                        nr_cpus_online;       /*    32     4 */
	int                        nr_cpus_avail;        /*    36     4 */
	char *                     cpu_desc;             /*    40     8 */
	char *                     cpuid;                /*    48     8 */
	long long unsigned int     total_mem;            /*    56     8 */
	/* --- cacheline 1 boundary (64 bytes) --- */
	int                        nr_cmdline;           /*    64     4 */

	/* XXX 4 bytes hole, try to pack */

	char *                     cmdline;              /*    72     8 */
	int                        nr_sibling_cores;     /*    80     4 */

	/* XXX 4 bytes hole, try to pack */

	char *                     sibling_cores;        /*    88     8 */
	int                        nr_sibling_threads;   /*    96     4 */

	/* XXX 4 bytes hole, try to pack */

	char *                     sibling_threads;      /*   104     8 */
	int                        nr_numa_nodes;        /*   112     4 */

	/* XXX 4 bytes hole, try to pack */

	char *                     numa_nodes;           /*   120     8 */
	/* --- cacheline 2 boundary (128 bytes) --- */
	int                        nr_pmu_mappings;      /*   128     4 */

	/* XXX 4 bytes hole, try to pack */

	char *                     pmu_mappings;         /*   136     8 */
	int                        nr_groups;            /*   144     4 */

	/* size: 152, cachelines: 3, members: 20 */
	/* sum members: 128, holes: 5, sum holes: 20 */
	/* padding: 4 */
	/* last cacheline: 24 bytes */
};
[acme@ssdandy linux]$

[acme@ssdandy linux]$ pahole -C perf_session_env --reorganize --show_reorg_steps ~/bin/perf | grep ^/ | grep -v Final
/* Moving 'nr_sibling_cores' from after 'cmdline' to after 'nr_cmdline' */
/* Moving 'nr_numa_nodes' from after 'sibling_threads' to after 'nr_sibling_threads' */
/* Moving 'nr_groups' from after 'pmu_mappings' to after 'nr_pmu_mappings' */
[acme@ssdandy linux]$

Final struct stats:

[acme@ssdandy linux]$ pahole -C perf_session_env --reorganize --show_reorg_steps ~/bin/perf | tail -4
	/* --- cacheline 2 boundary (128 bytes) --- */

	/* size: 128, cachelines: 2, members: 20 */
};   /* saved 24 bytes and 1 cacheline! */
[acme@ssdandy linux]$

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-3d9tshamloinzxcqeb7mtd1n@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-01-13 10:06:23 -03:00

160 lines
3.9 KiB
C

#ifndef __PERF_HEADER_H
#define __PERF_HEADER_H
#include <linux/perf_event.h>
#include <sys/types.h>
#include <stdbool.h>
#include "types.h"
#include "event.h"
#include <linux/bitmap.h>
enum {
HEADER_RESERVED = 0, /* always cleared */
HEADER_FIRST_FEATURE = 1,
HEADER_TRACING_DATA = 1,
HEADER_BUILD_ID,
HEADER_HOSTNAME,
HEADER_OSRELEASE,
HEADER_VERSION,
HEADER_ARCH,
HEADER_NRCPUS,
HEADER_CPUDESC,
HEADER_CPUID,
HEADER_TOTAL_MEM,
HEADER_CMDLINE,
HEADER_EVENT_DESC,
HEADER_CPU_TOPOLOGY,
HEADER_NUMA_TOPOLOGY,
HEADER_BRANCH_STACK,
HEADER_PMU_MAPPINGS,
HEADER_GROUP_DESC,
HEADER_LAST_FEATURE,
HEADER_FEAT_BITS = 256,
};
enum perf_header_version {
PERF_HEADER_VERSION_1,
PERF_HEADER_VERSION_2,
};
struct perf_file_section {
u64 offset;
u64 size;
};
struct perf_file_header {
u64 magic;
u64 size;
u64 attr_size;
struct perf_file_section attrs;
struct perf_file_section data;
/* event_types is ignored */
struct perf_file_section event_types;
DECLARE_BITMAP(adds_features, HEADER_FEAT_BITS);
};
struct perf_pipe_file_header {
u64 magic;
u64 size;
};
struct perf_header;
int perf_file_header__read(struct perf_file_header *header,
struct perf_header *ph, int fd);
struct perf_session_env {
char *hostname;
char *os_release;
char *version;
char *arch;
int nr_cpus_online;
int nr_cpus_avail;
char *cpu_desc;
char *cpuid;
unsigned long long total_mem;
int nr_cmdline;
int nr_sibling_cores;
int nr_sibling_threads;
int nr_numa_nodes;
int nr_pmu_mappings;
int nr_groups;
char *cmdline;
char *sibling_cores;
char *sibling_threads;
char *numa_nodes;
char *pmu_mappings;
};
struct perf_header {
enum perf_header_version version;
bool needs_swap;
u64 data_offset;
u64 data_size;
u64 feat_offset;
DECLARE_BITMAP(adds_features, HEADER_FEAT_BITS);
struct perf_session_env env;
};
struct perf_evlist;
struct perf_session;
int perf_session__read_header(struct perf_session *session);
int perf_session__write_header(struct perf_session *session,
struct perf_evlist *evlist,
int fd, bool at_exit);
int perf_header__write_pipe(int fd);
void perf_header__set_feat(struct perf_header *header, int feat);
void perf_header__clear_feat(struct perf_header *header, int feat);
bool perf_header__has_feat(const struct perf_header *header, int feat);
int perf_header__set_cmdline(int argc, const char **argv);
int perf_header__process_sections(struct perf_header *header, int fd,
void *data,
int (*process)(struct perf_file_section *section,
struct perf_header *ph,
int feat, int fd, void *data));
int perf_header__fprintf_info(struct perf_session *s, FILE *fp, bool full);
int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
const char *name, bool is_kallsyms, bool is_vdso);
int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir);
int perf_event__synthesize_attr(struct perf_tool *tool,
struct perf_event_attr *attr, u32 ids, u64 *id,
perf_event__handler_t process);
int perf_event__synthesize_attrs(struct perf_tool *tool,
struct perf_session *session,
perf_event__handler_t process);
int perf_event__process_attr(struct perf_tool *tool, union perf_event *event,
struct perf_evlist **pevlist);
int perf_event__synthesize_tracing_data(struct perf_tool *tool,
int fd, struct perf_evlist *evlist,
perf_event__handler_t process);
int perf_event__process_tracing_data(struct perf_tool *tool,
union perf_event *event,
struct perf_session *session);
int perf_event__synthesize_build_id(struct perf_tool *tool,
struct dso *pos, u16 misc,
perf_event__handler_t process,
struct machine *machine);
int perf_event__process_build_id(struct perf_tool *tool,
union perf_event *event,
struct perf_session *session);
bool is_perf_magic(u64 magic);
/*
* arch specific callback
*/
int get_cpuid(char *buffer, size_t sz);
#endif /* __PERF_HEADER_H */