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feat(profiling) support new ZendMM api (#2969)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| use crate::bindings::{self as zend}; | ||
| use crate::profiling::Profiler; | ||
| use crate::REQUEST_LOCALS; | ||
| use libc::size_t; | ||
| use log::{error, trace}; | ||
| use rand::rngs::ThreadRng; | ||
| use rand_distr::{Distribution, Poisson}; | ||
| use std::cell::RefCell; | ||
| use std::sync::atomic::AtomicU64; | ||
|
|
||
| #[cfg(php_zend_mm_set_custom_handlers_ex)] | ||
| mod allocation_ge84; | ||
| #[cfg(not(php_zend_mm_set_custom_handlers_ex))] | ||
| pub mod allocation_le83; | ||
|
|
||
| /// take a sample every 4096 KiB | ||
| pub const ALLOCATION_PROFILING_INTERVAL: f64 = 1024.0 * 4096.0; | ||
|
|
||
| /// This will store the count of allocations (including reallocations) during | ||
| /// a profiling period. This will overflow when doing more than u64::MAX | ||
| /// allocations, which seems big enough to ignore. | ||
| pub static ALLOCATION_PROFILING_COUNT: AtomicU64 = AtomicU64::new(0); | ||
|
|
||
| /// This will store the accumulated size of all allocations in bytes during the | ||
| /// profiling period. This will overflow when allocating more than 18 exabyte | ||
| /// of memory (u64::MAX) which might not happen, so we can ignore this. | ||
| pub static ALLOCATION_PROFILING_SIZE: AtomicU64 = AtomicU64::new(0); | ||
|
|
||
| pub struct AllocationProfilingStats { | ||
| /// number of bytes until next sample collection | ||
| next_sample: i64, | ||
| poisson: Poisson<f64>, | ||
| rng: ThreadRng, | ||
| } | ||
|
|
||
| impl AllocationProfilingStats { | ||
| fn new() -> AllocationProfilingStats { | ||
| // Safety: this will only error if lambda <= 0 | ||
| let poisson = Poisson::new(ALLOCATION_PROFILING_INTERVAL).unwrap(); | ||
| let mut stats = AllocationProfilingStats { | ||
| next_sample: 0, | ||
| poisson, | ||
| rng: rand::thread_rng(), | ||
| }; | ||
| stats.next_sampling_interval(); | ||
| stats | ||
| } | ||
|
|
||
| fn next_sampling_interval(&mut self) { | ||
| self.next_sample = self.poisson.sample(&mut self.rng) as i64; | ||
| } | ||
|
|
||
| fn track_allocation(&mut self, len: size_t) { | ||
| self.next_sample -= len as i64; | ||
|
|
||
| if self.next_sample > 0 { | ||
| return; | ||
| } | ||
|
|
||
| self.next_sampling_interval(); | ||
|
|
||
| if let Some(profiler) = Profiler::get() { | ||
| // Safety: execute_data was provided by the engine, and the profiler doesn't mutate it. | ||
| unsafe { | ||
| profiler.collect_allocations( | ||
| zend::ddog_php_prof_get_current_execute_data(), | ||
| 1_i64, | ||
| len as i64, | ||
| ) | ||
| }; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| thread_local! { | ||
| static ALLOCATION_PROFILING_STATS: RefCell<AllocationProfilingStats> = | ||
| RefCell::new(AllocationProfilingStats::new()); | ||
| } | ||
|
|
||
| pub fn alloc_prof_ginit() { | ||
| #[cfg(not(php_zend_mm_set_custom_handlers_ex))] | ||
| allocation_le83::alloc_prof_ginit(); | ||
| #[cfg(php_zend_mm_set_custom_handlers_ex)] | ||
| allocation_ge84::alloc_prof_ginit(); | ||
| } | ||
|
|
||
| pub fn alloc_prof_gshutdown() { | ||
| #[cfg(php_zend_mm_set_custom_handlers_ex)] | ||
| allocation_ge84::alloc_prof_gshutdown(); | ||
| } | ||
|
|
||
| #[cfg(not(php_zend_mm_set_custom_handlers_ex))] | ||
| pub fn alloc_prof_startup() { | ||
| allocation_le83::alloc_prof_startup(); | ||
| } | ||
|
|
||
| pub fn alloc_prof_rinit() { | ||
| let allocation_profiling: bool = REQUEST_LOCALS.with(|cell| { | ||
| match cell.try_borrow() { | ||
| Ok(locals) => { | ||
| let system_settings = locals.system_settings(); | ||
| system_settings.profiling_allocation_enabled | ||
| }, | ||
| Err(_err) => { | ||
| error!("Memory allocation was not initialized correctly due to a borrow error. Please report this to Datadog."); | ||
| false | ||
| } | ||
| } | ||
| }); | ||
|
|
||
| if !allocation_profiling { | ||
| return; | ||
| } | ||
|
|
||
| #[cfg(not(php_zend_mm_set_custom_handlers_ex))] | ||
| allocation_le83::alloc_prof_rinit(); | ||
| #[cfg(php_zend_mm_set_custom_handlers_ex)] | ||
| allocation_ge84::alloc_prof_rinit(); | ||
|
|
||
| trace!("Memory allocation profiling enabled.") | ||
| } | ||
|
|
||
| pub fn alloc_prof_rshutdown() { | ||
| let allocation_profiling = REQUEST_LOCALS.with(|cell| { | ||
| cell.try_borrow() | ||
| .map(|locals| locals.system_settings().profiling_allocation_enabled) | ||
| .unwrap_or(false) | ||
| }); | ||
|
|
||
| if !allocation_profiling { | ||
| return; | ||
| } | ||
|
|
||
| #[cfg(not(php_zend_mm_set_custom_handlers_ex))] | ||
| allocation_le83::alloc_prof_rshutdown(); | ||
| #[cfg(php_zend_mm_set_custom_handlers_ex)] | ||
| allocation_ge84::alloc_prof_rshutdown(); | ||
| } |
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