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|
use std::{
alloc::{GlobalAlloc, Layout, System},
sync::atomic::{AtomicBool, AtomicUsize, Ordering},
};
pub struct TracingAllocator {
pub inner: System,
pub stats: TracedStats,
}
impl TracingAllocator {
#[allow(clippy::new_without_default)] // not applicable here
pub const fn new() -> Self {
Self {
inner: System,
stats: TracedStats::new(),
}
}
pub fn stats(&self) -> &TracedStats {
&self.stats
}
pub fn reset(&self) {
self.stats.reset();
}
pub fn start_profiling(&self) {
self.stats.start_profiling()
}
pub fn end_profiling(&self) {
self.stats.end_profiling()
}
}
unsafe impl GlobalAlloc for TracingAllocator {
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
self.stats.push_allocations(layout);
self.inner.alloc(layout)
}
unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
self.stats.push_deallocations(layout);
self.inner.dealloc(ptr, layout);
}
}
#[derive(Debug)]
pub struct TracedStats {
is_active: AtomicBool,
len_allocations: AtomicUsize,
len_deallocations: AtomicUsize,
current_memory_usage: AtomicUsize,
total_memory_usage: AtomicUsize,
}
impl TracedStats {
const fn new() -> Self {
Self {
is_active: AtomicBool::new(false),
len_allocations: AtomicUsize::new(0),
len_deallocations: AtomicUsize::new(0),
current_memory_usage: AtomicUsize::new(0),
total_memory_usage: AtomicUsize::new(0),
}
}
pub fn len_allocations(&self) -> usize {
self.len_allocations.load(Ordering::SeqCst)
}
pub fn len_deallocations(&self) -> usize {
self.len_deallocations.load(Ordering::SeqCst)
}
pub fn current_allocated_bytes(&self) -> usize {
self.current_memory_usage.load(Ordering::SeqCst)
}
pub fn total_allocated_bytes(&self) -> usize {
self.total_memory_usage.load(Ordering::SeqCst)
}
fn is_active(&self) -> bool {
self.is_active.load(Ordering::SeqCst)
}
fn reset(&self) {
self.len_allocations.store(0, Ordering::SeqCst);
self.len_deallocations.store(0, Ordering::SeqCst);
self.current_memory_usage.store(0, Ordering::SeqCst);
self.total_memory_usage.store(0, Ordering::SeqCst);
}
fn start_profiling(&self) {
self.is_active.store(true, Ordering::SeqCst);
}
fn end_profiling(&self) {
self.is_active.store(false, Ordering::SeqCst);
}
fn push_allocations(&self, layout: Layout) {
let size = layout.size();
if !self.is_active() || size == 0 {
return;
}
self.len_allocations.fetch_add(1, Ordering::SeqCst);
self.current_memory_usage.fetch_add(size, Ordering::SeqCst);
self.total_memory_usage.fetch_add(size, Ordering::SeqCst);
}
fn push_deallocations(&self, layout: Layout) {
let size = layout.size();
if !self.is_active() || size == 0 {
return;
}
self.len_deallocations.fetch_add(1, Ordering::SeqCst);
self.current_memory_usage.fetch_sub(size, Ordering::SeqCst);
}
}
|
