PERF-DLFILTER(1)                  perf Manual                 PERF-DLFILTER(1)

<?><?><?> (NAME)
       perf-dlfilter - <?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?> <?><?>
       <?><?><?><?><?><?><?> <?><?> <?><?> <?><?><?><?> <?><?><?>
       <?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?>

<?><?><?><?><?> <?><?><?><?><?> (SYNOPSIS)
       perf script [--dlfilter file.so ] [ --dlarg arg ]...

<?><?><?><?><?><?><?> (DESCRIPTION)
       <?><?><?> <?><?><?><?><?> <?><?><?><?> <?><?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?> <?><?><?><?> <?><?> <?><?><?><?><?>
       <?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?> <?><?><?><?> <?><?>
       <?><?><?><?> <?><?><?> <?><?><?><?><?> (shared object)
       <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?><?><?>.
       <?><?><?><?><?><?><?><?><?><?> <?><?> <?><?><?><?><?><?><?> <?><?>
       <?><?><?><?><?><?><?> <?><?> --dlarg <?><?><?><?><?> <?><?><?> <?>
       <?><?> <?><?><?><?><?><?><?> <?><?> perf_dlfilter_fns.args()
       <?><?><?><?><?><?><?> <?><?><?><?>.

       <?><?><?> file.so <?><?><?><?> <</>> <?><?><?><?><?><?> <?><?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?> <?><?> <?><?> <?><?><?><?>
       <?><?><?><?><?><?> <?><?><?><?><?><?><?><?> perf <?><?> <?><?><?><?>
       <?><?><?><?> <?> <?><?><?> <?><?><?><?> ~/libexec/perf-core/dlfilters
       <?><?><?> (<?><?><?><?> <?><?><?><?> <?><?> perf --exec-path)<?> <?><?>
       <?><?> <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?> (dynamic linker) <?><?><?><?><?> <?><?><?><?><?> <?><?>.

<?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?> (API)
       <?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?> (API) <?><?><?><?>
       <?><?><?><?><?> <?><?><?><?> <?><?><?><?> <?><?><?><?><?> <?><?><?>
       <?><?><?>:

           #include <perf/perf_dlfilter.h>

           struct perf_dlfilter_fns perf_dlfilter_fns;

           int start(void **data, void *ctx);
           int stop(void *data, void *ctx);
           int filter_event(void *data, const struct perf_dlfilter_sample *sample, void *ctx);
           int filter_event_early(void *data, const struct perf_dlfilter_sample *sample, void *ctx);
           const char *filter_description(const char **long_description);

       <?><?> <?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?> start <?><?>
       <?><?><?><?><?><?> <?><?><?> <?><?> <?><?> <?><?><?><?><?><?><?><?>
       <?><?> filter_event <?><?> filter_event_early <?><?><?><?><?><?><?><?>
       <?><?><?><?><?> <?><?>. <?><?><?><?> <?><?><?><?><?> <?><?><?><?><?><?>
       0 <?><?> <?><?> <?><?> <?><?><?><?> <?><?><?><?> <?><?>
       <?><?><?><?><?><?><?><?><?>. <?><?><?><?><?><?><?> *data <?><?>
       <?><?><?><?> <?><?><?><?><?><?><?> <?><?><?><?> <?><?><?><?>
       <?><?><?><?><?> <?><?><?><?><?><?><?><?> <?><?><?>.
       <?><?><?><?><?><?><?> ctx <?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?> perf_dlfilter_fns <?><?><?><?>
       <?><?><?><?> <?><?><?><?> <?><?><?> <?><?><?><?> <?><?><?><?><?>
       perf_dlfilter_fns <?><?><?><?><?> <?><?><?><?><?><?><?><?> <?><?>
       <?><?><?><?> start <?><?><?><?><?> <?><?><?><?><?><?>.

       <?><?> <?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?> stop <?><?>
       <?><?><?><?><?><?> <?><?> <?><?> <?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?> filter_event <?><?> filter_event_early
       <?><?><?><?><?><?><?><?> <?><?><?><?><?> <?><?>. <?><?><?><?>
       <?><?><?><?><?> <?><?><?><?><?><?> 0 <?><?> <?><?> <?><?> <?><?><?><?>
       <?><?><?><?> <?><?> <?><?><?><?><?><?><?><?><?>. <?><?><?><?><?> data
       <?><?><?><?> start <?><?><?><?><?> <?><?><?><?><?><?>.
       <?><?><?><?><?><?><?> ctx <?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?> perf_dlfilter_fns <?><?><?><?>
       <?><?><?><?> <?><?><?> <?><?><?><?><?> <?><?><?><?><?>
       perf_dlfilter_fns <?><?><?><?><?> <?><?><?><?><?><?><?><?> <?><?>
       <?><?><?><?> stop <?><?><?><?><?> <?><?><?><?><?><?>.

       <?><?> <?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?> filter_event
       <?><?><?><?> <?><?> <?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?> <?><?>. <?><?><?><?> <?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?> 0<?>
       <?><?><?><?> <?><?><?><?><?> <?><?><?><?> (<?><?><?><?><?><?>
       <?><?><?><?><?>) <?><?> 1<?> <?><?> <?><?> <?><?> <?><?><?><?>
       <?><?><?><?> <?><?> <?><?><?><?><?><?><?><?><?>. <?><?><?><?><?> data
       <?><?><?><?> start <?><?><?><?><?> <?><?><?><?><?><?>.
       <?><?><?><?><?><?><?> ctx <?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?> perf_dlfilter_fns <?><?><?><?>
       <?><?><?><?> <?><?><?>.

       <?><?><?><?> filter_event_early <?><?><?><?><?> filter_event
       <?><?><?><?> <?><?> <?><?><?> <?><?><?><?><?> <?><?> <?><?><?> <?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?>.

       <?><?> <?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>
       filter_description <?><?><?><?> <?><?> <?><?><?><?><?>
       <?><?><?><?><?><?> <?><?> <?><?><?><?><?> <?> <?><?> <?><?><?><?>
       <?><?><?><?><?> <?><?> <?><?><?><?><?> <?><?><?><?><?><?><?><?><?>
       <?><?> <?><?><?><?><?><?><?><?><?>.

       <?><?><?> <?><?><?><?><?> <?><?> <?><?><?><?><?><?><?> sample <?><?>
       <?><?> <?><?><?><?><?><?> <?><?><?><?><?> filter_event <?>
       filter_event_early <?><?><?><?><?><?> <?><?><?><?><?> (<?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?>) <?><?><?><?> <?><?><?><?><?><?><?>.

       <?><?><?> <?><?><?><?><?> <?><?> <?><?><?><?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?> <?><?><?><?> <?><?><?><?><?><?><?><?><?><?> <?><?>
       struct perf_dlfilter_sample <?><?> <?><?> <?><?><?><?><?><?>
       <?><?><?><?><?> filter_event <?> filter_event_early <?><?><?><?><?><?>
       <?><?><?><?><?> (<?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>)
       <?><?><?><?> <?><?><?><?><?><?><?><?>.

   <?><?><?><?><?><?> perf_dlfilter_sample
       <?><?> <?><?><?><?><?> filter_event <?> filter_event_early <?><?>
       <?><?><?><?><?><?> perf_dlfilter_sample <?><?><?><?><?>
       <?><?><?><?><?><?> <?><?> <?><?><?><?> <?><?><?><?><?><?><?> <?><?><?>
       <?><?><?>:

           /*
            * perf sample event information (as per perf script and <linux/perf_event.h>)
            */
           struct perf_dlfilter_sample {
                   __u32 size; /* Size of this structure (for compatibility checking) */
                   __u16 ins_lat;          /* Refer PERF_SAMPLE_WEIGHT_TYPE in <linux/perf_event.h> */
                   __u16 p_stage_cyc;      /* Refer PERF_SAMPLE_WEIGHT_TYPE in <linux/perf_event.h> */
                   __u64 ip;
                   __s32 pid;
                   __s32 tid;
                   __u64 time;
                   __u64 addr;
                   __u64 id;
                   __u64 stream_id;
                   __u64 period;
                   __u64 weight;           /* Refer PERF_SAMPLE_WEIGHT_TYPE in <linux/perf_event.h> */
                   __u64 transaction;      /* Refer PERF_SAMPLE_TRANSACTION in <linux/perf_event.h> */
                   __u64 insn_cnt; /* For instructions-per-cycle (IPC) */
                   __u64 cyc_cnt;          /* For instructions-per-cycle (IPC) */
                   __s32 cpu;
                   __u32 flags;            /* Refer PERF_DLFILTER_FLAG_* above */
                   __u64 data_src;         /* Refer PERF_SAMPLE_DATA_SRC in <linux/perf_event.h> */
                   __u64 phys_addr;        /* Refer PERF_SAMPLE_PHYS_ADDR in <linux/perf_event.h> */
                   __u64 data_page_size;   /* Refer PERF_SAMPLE_DATA_PAGE_SIZE in <linux/perf_event.h> */
                   __u64 code_page_size;   /* Refer PERF_SAMPLE_CODE_PAGE_SIZE in <linux/perf_event.h> */
                   __u64 cgroup;           /* Refer PERF_SAMPLE_CGROUP in <linux/perf_event.h> */
                   __u8  cpumode;          /* Refer CPUMODE_MASK etc in <linux/perf_event.h> */
                   __u8  addr_correlates_sym; /* True => resolve_addr() can be called */
                   __u16 misc;             /* Refer perf_event_header in <linux/perf_event.h> */
                   __u32 raw_size;         /* Refer PERF_SAMPLE_RAW in <linux/perf_event.h> */
                   const void *raw_data;   /* Refer PERF_SAMPLE_RAW in <linux/perf_event.h> */
                   __u64 brstack_nr;       /* Number of brstack entries */
                   const struct perf_branch_entry *brstack; /* Refer <linux/perf_event.h> */
                   __u64 raw_callchain_nr; /* Number of raw_callchain entries */
                   const __u64 *raw_callchain; /* Refer <linux/perf_event.h> */
                   const char *event;
                   __s32 machine_pid;
                   __s32 vcpu;
           };

       <?><?><?><?>: machine_pid <?> vcpu <?><?> <?><?><?><?><?>
       <?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?> <?><?> <?><?><?><?><?><?> <?><?><?><?><?>
       <?><?><?><?><?><?><?>. <?><?> size <?><?><?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?> <?><?><?><?> <?><?><?><?><?> <?><?> <?><?><?><?>
       <?><?><?><?> <?><?><?><?><?><?><?> <?><?><?>. <?><?> <?><?><?><?><?>
       <?><?> <?><?><?><?><?> <?><?> <?><?><?><?> <?><?><?><?><?><?><?>
       <?><?><?><?> <?><?><?><?><?> <?><?><?><?><?><?>
       PERF_DLFILTER_HAS_MACHINE_PID <?><?><?><?><?> <?><?><?><?><?> <?><?>.
       <?><?><?><?> <?><?><?><?>:

           #include <perf/perf_dlfilter.h>
           #include <stddef.h>
           #include <stdbool.h>

           static inline bool have_machine_pid(const struct perf_dlfilter_sample *sample)
           {
           #ifdef PERF_DLFILTER_HAS_MACHINE_PID
                   return sample->size >= offsetof(struct perf_dlfilter_sample, vcpu) + sizeof(sample->vcpu);
           #else
                   return false;
           #endif
           }

   <?><?><?><?><?><?> perf_dlfilter_fns
       <?><?><?><?><?><?> perf_dlfilter_fns <?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?> <?><?>
       <?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?> <?><?>
       <?><?><?><?><?><?>. <?><?><?> <?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?> filter_event <?><?>
       filter_event_early <?><?><?><?><?><?><?><?> <?><?><?><?>.

           struct perf_dlfilter_fns {
                   const struct perf_dlfilter_al *(*resolve_ip)(void *ctx);
                   const struct perf_dlfilter_al *(*resolve_addr)(void *ctx);
                   char **(*args)(void *ctx, int *dlargc);
                   __s32 (*resolve_address)(void *ctx, __u64 address, struct perf_dlfilter_al *al);
                   const __u8 *(*insn)(void *ctx, __u32 *length);
                   const char *(*srcline)(void *ctx, __u32 *line_number);
                   struct perf_event_attr *(*attr)(void *ctx);
                   __s32 (*object_code)(void *ctx, __u64 ip, void *buf, __u32 len);
                   void (*al_cleanup)(void *ctx, struct perf_dlfilter_al *al);
                   void *(*reserved[119])(void *);
           };

       <?><?><?><?> resolve_ip <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?>
       ip <?><?><?><?><?><?><?><?><?><?><?><?>.

       <?><?><?><?> resolve_addr <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> addr <?><?><?><?><?><?><?><?><?><?><?><?> (<?><?>
       <?><?><?><?> <?><?><?><?><?><?> <?><?><?><?> addr_correlates_sym).

       <?><?><?><?> args <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?> <?><?><?><?><?><?><?><?><?> --dlarg <?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?>.

       <?><?><?><?> resolve_address <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> address <?><?><?><?><?> <?><?><?><?><?><?>.
       <?><?><?><?><?> al->size <?><?><?><?> <?><?><?> <?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?> <?><?><?>. <?><?> <?><?><?><?>
       <?><?><?><?><?><?> 0 <?> <?><?> <?><?><?> <?><?><?> <?><?><?><?> -1
       <?><?><?><?><?><?><?><?><?><?><?>. <?><?><?><?><?><?> <?><?>
       <?><?><?><?> <?><?> <?><?><?><?><?><?><?><?> al <?><?><?><?><?>
       <?><?><?><?><?> al_cleanup() <?><?> (<?><?> <?><?><?><?>
       <?><?><?><?><?> <?><?><?> <?><?><?> <?><?> <?><?><?><?><?><?>)
       <?><?><?><?><?><?><?><?> <?><?><?><?>.

       <?><?><?><?> insn <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?> <?><?><?> <?><?> <?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?>.

       <?><?><?><?> srcline <?><?><?> <?><?><?><?> <?><?><?><?> <?>
       <?><?><?><?><?><?> <?><?> <?><?> <?><?><?><?><?><?><?><?><?><?><?><?>.

       <?><?><?><?> attr <?><?><?><?><?><?> perf_event_attr <?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?> <?><?><?><?>
       <?><?> <linux/perf_event.h>.

       <?><?><?><?> object_code <?><?> <?><?><?> (object code) <?><?>
       <?><?><?><?><?><?><?><?> <?> <?><?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?>.

       <?><?><?><?> al_cleanup <?><?><?><?> <?><?> <?><?> resolve_address()
       <?><?><?><?><?><?><?><?> <?><?><?> (<?><?> <?><?><?><?> <?><?><?><?><?>
       <?><?><?><?><?><?><?><?> perf_dlfilter_fns.al_cleanup != NULL <?><?>
       <?><?><?><?><?> <?><?><?><?>) <?><?> <?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?> <?><?><?><?>.

       <?><?><?> <?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?> <?><?> <?><?><?><?> perf_dlfilter_fns
       <?><?> <?><?> <?><?><?><?><?><?> filter_event <?> filter_event_early
       <?><?><?><?><?> (<?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>)
       <?><?><?><?> <?><?><?><?><?><?><?><?>.

   <?><?><?><?><?><?> perf_dlfilter_al
       <?><?><?><?><?><?> perf_dlfilter_al <?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?> <?><?> <?><?><?><?>
       <?><?><?>.

           /*
            * Address location (as per perf script)
            */
           struct perf_dlfilter_al {
                   __u32 size; /* Size of this structure (for compatibility checking) */
                   __u32 symoff;
                   const char *sym;
                   __u64 addr; /* Mapped address (from dso) */
                   __u64 sym_start;
                   __u64 sym_end;
                   const char *dso;
                   __u8  sym_binding; /* STB_LOCAL, STB_GLOBAL or STB_WEAK, refer <elf.h> */
                   __u8  is_64_bit; /* Only valid if dso is not NULL */
                   __u8  is_kernel_ip; /* True if in kernel space */
                   __u32 buildid_size;
                   __u8 *buildid;
                   /* Below members are only populated by resolve_ip() */
                   __u8 filtered; /* true if this sample event will be filtered out */
                   const char *comm;
                   void *priv; /* Private data. Do not change */
           };

       <?><?><?> <?><?><?><?><?> <?><?><?><?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?> <?><?><?><?> <?><?><?><?><?><?><?><?><?><?> <?><?>
       struct perf_dlfilter_al <?><?> <?><?> <?><?><?><?><?><?> filter_event
       <?> filter_event_early <?><?><?><?><?> (<?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?>) <?><?><?><?>
       <?><?><?><?><?><?><?><?>.

   <?><?><?><?><?><?><?><?> perf_dlfilter_sample
       <?><?><?> flags <?><?> <?><?><?><?><?><?> perf_dlfilter_sample
       <?><?><?><?><?><?> <?><?> <?><?><?><?> flags <?><?> perf script
       <?><?><?>. <?><?><?><?><?><?><?> <?><?><?> <?><?><?><?><?><?><?> <?><?>
       <?><?><?> <?><?><?> <?><?><?>:

           /* Definitions for perf_dlfilter_sample flags */
           enum {
                   PERF_DLFILTER_FLAG_BRANCH       = 1ULL << 0,
                   PERF_DLFILTER_FLAG_CALL         = 1ULL << 1,
                   PERF_DLFILTER_FLAG_RETURN       = 1ULL << 2,
                   PERF_DLFILTER_FLAG_CONDITIONAL  = 1ULL << 3,
                   PERF_DLFILTER_FLAG_SYSCALLRET   = 1ULL << 4,
                   PERF_DLFILTER_FLAG_ASYNC        = 1ULL << 5,
                   PERF_DLFILTER_FLAG_INTERRUPT    = 1ULL << 6,
                   PERF_DLFILTER_FLAG_TX_ABORT     = 1ULL << 7,
                   PERF_DLFILTER_FLAG_TRACE_BEGIN  = 1ULL << 8,
                   PERF_DLFILTER_FLAG_TRACE_END    = 1ULL << 9,
                   PERF_DLFILTER_FLAG_IN_TX        = 1ULL << 10,
                   PERF_DLFILTER_FLAG_VMENTRY      = 1ULL << 11,
                   PERF_DLFILTER_FLAG_VMEXIT       = 1ULL << 12,
           };

<?><?><?><?><?><?><?> (EXAMPLES)
       <?><?><?><?><?> <?><?><?><?> <?><?><?><?><?><?><?> <?><?> <?><?>
       <?><?><?><?><?><?><?><?><?> <?><?> "foo" <?><?> "bar":

           #include <perf/perf_dlfilter.h>
           #include <string.h>

           struct perf_dlfilter_fns perf_dlfilter_fns;

           int filter_event(void *data, const struct perf_dlfilter_sample *sample, void *ctx)
           {
                   const struct perf_dlfilter_al *al;
                   const struct perf_dlfilter_al *addr_al;

                   if (!sample->ip || !sample->addr_correlates_sym)
                           return 1;

                   al = perf_dlfilter_fns.resolve_ip(ctx);
                   if (!al || !al->sym || strcmp(al->sym, "foo"))
                           return 1;

                   addr_al = perf_dlfilter_fns.resolve_addr(ctx);
                   if (!addr_al || !addr_al->sym || strcmp(addr_al->sym, "bar"))
                           return 1;

                   return 0;
           }

       <?><?><?><?> <?><?><?><?> <?><?><?> <?><?><?><?><?><?> <?><?> <?><?><?>
       <?><?><?><?><?> perf <?><?><?><?> <?><?><?><?><?> <?><?><?><?>
       <?><?><?> <?><?><?> <?><?><?> (<?><?><?><?> perf_dlfilter.h <?><?>
       ~/include/perf <?><?><?><?> <?><?><?><?>):

           gcc -c -I ~/include -fpic dlfilter-example.c
           gcc -shared -o dlfilter-example.so dlfilter-example.o

       <?><?><?><?> <?><?><?><?><?><?><?> <?><?> <?><?><?><?><?> <?><?>
       <?><?><?><?><?> perf script:

           perf script --dlfilter dlfilter-example.so

<?><?><?><?> (NOTES)
       <?><?><?><?> dlfilter .so <?><?> <?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?> <?><?><?><?><?><?> <?><?><?><?><?> <?><?><?>. <?><?>
       <?><?><?><?> <?><?><?><?><?> <?><?><?><?><?><?> <?><?><?><?> <?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?> .so <?><?><?><?><?> <?><?><?><?>.
       <?><?><?><?><?><?> <?><?><?> <?><?><?><?> .so <?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?> <?><?>
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       <?><?> <?><?><?><?> perf <?><?><?><?><?><?><?> <?><?><?><?><?><?>
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perf                              09/04/2026                  PERF-DLFILTER(1)