src/gc-alloc-profiler.h - master - githubmirror/julia

src/gc-alloc-profiler.h
60 строк2 KB
Ian Butterworth
Profile.Allocs: annotate the root-marking callback as JL_NOTSAFEPOINT
24 июл 2026, 02:44
24 июл 2026, 02:44adb6746
// This file is a part of Julia. License is MIT: https://julialang.org/license

#ifndef JL_GC_ALLOC_PROFILER_H
#define JL_GC_ALLOC_PROFILER_H

#include "julia.h"
#include "ios.h"

#ifdef __cplusplus
extern "C" {
#endif

// ---------------------------------------------------------------------
// The public interface to call from Julia for allocations profiling
// ---------------------------------------------------------------------

// Forward-declaration to avoid dependency in header file.
struct jl_raw_alloc_t;  // Defined in gc-alloc-profiler.c

typedef struct {
    struct jl_raw_alloc_t *allocs;
    size_t num_allocs;
} jl_profile_allocs_raw_results_t;

JL_DLLEXPORT void jl_start_alloc_profile(double sample_rate);
JL_DLLEXPORT jl_profile_allocs_raw_results_t jl_fetch_alloc_profile(void);
JL_DLLEXPORT void jl_stop_alloc_profile(void);
JL_DLLEXPORT int jl_alloc_profile_is_running(void);
JL_DLLEXPORT void jl_free_alloc_profile(void);

// Report every recorded type pointer to `f`, for GC root marking, so that the
// types referenced by recorded allocations stay valid until the profile is freed.
typedef void (*jl_alloc_profile_root_cb_t)(jl_value_t*, void*) JL_NOTSAFEPOINT;
void jl_gc_foreach_alloc_profile_root(jl_alloc_profile_root_cb_t f, void *env) JL_NOTSAFEPOINT;

// ---------------------------------------------------------------------
// Functions to call from GC when alloc profiling is enabled
// ---------------------------------------------------------------------

void _maybe_record_alloc_to_profile(jl_value_t *val, size_t size, jl_datatype_t *typ) JL_NOTSAFEPOINT;

extern _Atomic(int) g_alloc_profile_enabled;

// This should only be used from _deprecated_ code paths. We shouldn't see UNKNOWN anymore.
#define jl_gc_unknown_type_tag ((jl_datatype_t*)0xdeadaa03)

static inline void maybe_record_alloc_to_profile(jl_value_t *val, size_t size, jl_datatype_t *typ) JL_NOTSAFEPOINT {
    // relaxed: the slow path re-checks the flag with the ordering needed to
    // synchronize with `jl_stop_alloc_profile`
    if (__unlikely(jl_atomic_load_relaxed(&g_alloc_profile_enabled))) {
        _maybe_record_alloc_to_profile(val, size, typ);
    }
}

#ifdef __cplusplus
}
#endif


#endif  // JL_GC_ALLOC_PROFILER_H