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YJIT: Avoid accumulating freed pages in the payload (#6657)

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Co-Authored-By: Alan Wu <alansi.xingwu@shopify.com>
Co-Authored-By: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@shopify.com>

Co-authored-by: Alan Wu <alansi.xingwu@shopify.com>
Co-authored-by: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@shopify.com>
This commit is contained in:
Takashi Kokubun 2022-11-02 08:14:31 -07:00 committed by GitHub
parent 4a8cd9e8bc
commit 946bb34fb5
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GPG Key ID: 4AEE18F83AFDEB23
Notes: git 2022-11-02 15:14:53 +00:00 
Merged-By: maximecb <maximecb@ruby-lang.org>
2 changed files with 34 additions and 9 deletions
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6
yjit/src/asm/mod.rs
View File

@ -6,6 +6,8 @@ use std::rc::Rc;
use crate::backend::x86_64::JMP_PTR_BYTES;
#[cfg(target_arch = "aarch64")]
use crate::backend::arm64::JMP_PTR_BYTES;
use crate::core::IseqPayload;
use crate::core::for_each_off_stack_iseq_payload;
use crate::core::for_each_on_stack_iseq_payload;
use crate::invariants::rb_yjit_tracing_invalidate_all;
use crate::stats::incr_counter;
@ -571,6 +573,10 @@ impl CodeBlock {
let mut freed_pages: Vec<usize> = pages_in_use.iter().enumerate()
.filter(|&(_, &in_use)| !in_use).map(|(page, _)| page).collect();
self.free_pages(&freed_pages);
// Avoid accumulating freed pages for future code GC
for_each_off_stack_iseq_payload(|iseq_payload: &mut IseqPayload| {
iseq_payload.pages.clear();
});
// Append virtual pages in case RubyVM::YJIT.code_gc is manually triggered.
let mut virtual_pages: Vec<usize> = (self.num_mapped_pages()..self.num_virtual_pages()).collect();

37
yjit/src/core.rs
View File

@ -552,20 +552,39 @@ pub fn for_each_iseq<F: FnMut(IseqPtr)>(mut callback: F) {
unsafe { rb_yjit_for_each_iseq(Some(callback_wrapper), (&mut data) as *mut _ as *mut c_void) };
}
/// Iterate over all on-stack ISEQ payloads
#[cfg(not(test))]
pub fn for_each_on_stack_iseq_payload<F: FnMut(&IseqPayload)>(mut callback: F) {
/// Iterate over all on-stack ISEQs
pub fn for_each_on_stack_iseq<F: FnMut(IseqPtr)>(mut callback: F) {
unsafe extern "C" fn callback_wrapper(iseq: IseqPtr, data: *mut c_void) {
let callback: &mut &mut dyn FnMut(&IseqPayload) -> bool = std::mem::transmute(&mut *data);
let callback: &mut &mut dyn FnMut(IseqPtr) -> bool = std::mem::transmute(&mut *data);
callback(iseq);
}
let mut data: &mut dyn FnMut(IseqPtr) = &mut callback;
unsafe { rb_jit_cont_each_iseq(Some(callback_wrapper), (&mut data) as *mut _ as *mut c_void) };
}
/// Iterate over all on-stack ISEQ payloads
pub fn for_each_on_stack_iseq_payload<F: FnMut(&IseqPayload)>(mut callback: F) {
for_each_on_stack_iseq(|iseq| {
if let Some(iseq_payload) = get_iseq_payload(iseq) {
callback(iseq_payload);
}
}
let mut data: &mut dyn FnMut(&IseqPayload) = &mut callback;
unsafe { rb_jit_cont_each_iseq(Some(callback_wrapper), (&mut data) as *mut _ as *mut c_void) };
});
}
/// Iterate over all NOT on-stack ISEQ payloads
pub fn for_each_off_stack_iseq_payload<F: FnMut(&mut IseqPayload)>(mut callback: F) {
let mut on_stack_iseqs: Vec<IseqPtr> = vec![];
for_each_on_stack_iseq(|iseq| {
on_stack_iseqs.push(iseq);
});
for_each_iseq(|iseq| {
if !on_stack_iseqs.contains(&iseq) {
if let Some(iseq_payload) = get_iseq_payload(iseq) {
callback(iseq_payload);
}
}
})
}
#[cfg(test)]
pub fn for_each_on_stack_iseq_payload<F: FnMut(&IseqPayload)>(mut _callback: F) {}
/// Free the per-iseq payload
#[no_mangle]