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d297d08c6b
#5244 Pass `JEMALLOC_SYS_WITH_LG_PAGE=16` env to aarch64 cross-compilation to support systems with up to 64-KiB page sizes. This is backwards-compatible for the current (most usual) 4-KiB systems.
72 lines
2.1 KiB
Rust
72 lines
2.1 KiB
Rust
//! Provides utilities for configuring the system allocator.
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//!
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//! ## Conditional Compilation
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//!
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//! This crate can be compiled with different feature flags to support different allocators:
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//!
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//! - Jemalloc, via the `jemalloc` feature.
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//! - GNU malloc, if no features are set and the system supports it.
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//! - The system allocator, if no features are set and the allocator is not GNU malloc.
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//!
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//! It is assumed that if Jemalloc is not in use, and the following two statements are correct then
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//! we should expect to configure `glibc`:
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//!
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//! - `target_os = linux`
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//! - `target_env != musl`
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//!
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//! If the above conditions are fulfilled but `glibc` still isn't present at runtime then a panic
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//! may be triggered. It is understood that there's no way to be certain that a compatible `glibc`
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//! is present: https://github.com/rust-lang/rust/issues/33244.
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//!
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//! ## Notes
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//!
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//! It's not clear how to precisely determine what the underlying allocator is. The efforts at
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//! detecting `glibc` are best-effort. If this crate throws errors about undefined external
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//! functions, then try to compile with the `not_glibc_interface` module.
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#[cfg(all(
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target_os = "linux",
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not(target_env = "musl"),
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not(feature = "jemalloc")
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))]
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pub mod glibc;
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#[cfg(feature = "jemalloc")]
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pub mod jemalloc;
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pub use interface::*;
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#[cfg(all(
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target_os = "linux",
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not(target_env = "musl"),
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not(feature = "jemalloc")
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))]
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mod interface {
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pub use crate::glibc::configure_glibc_malloc as configure_memory_allocator;
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pub use crate::glibc::scrape_mallinfo_metrics as scrape_allocator_metrics;
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}
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#[cfg(feature = "jemalloc")]
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mod interface {
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#[allow(dead_code)]
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pub fn configure_memory_allocator() -> Result<(), String> {
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Ok(())
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}
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pub use crate::jemalloc::scrape_jemalloc_metrics as scrape_allocator_metrics;
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}
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#[cfg(all(
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any(not(target_os = "linux"), target_env = "musl"),
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not(feature = "jemalloc")
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))]
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mod interface {
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#[allow(dead_code, clippy::unnecessary_wraps)]
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pub fn configure_memory_allocator() -> Result<(), String> {
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Ok(())
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}
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#[allow(dead_code)]
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pub fn scrape_allocator_metrics() {}
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}
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