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vmm: memory_manager: use available_parallelism for prefault threads

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Use std::thread::available_parallelism() when sizing the prefault
worker threads so the number of threads scales with the host CPU
count instead of relying on unsafe sysconf.

Fixes: #8495

Signed-off-by: Pulak Kanti Bhowmick <pkbhowmick007@gmail.com>
This commit is contained in:
Pulak Kanti Bhowmick
2026-07-07 21:53:34 +07:00
committed by Rob Bradford
parent 818fc07266
commit 03e229786d
1 changed files with 3 additions and 8 deletions
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11
vmm/src/memory_manager.rs
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@@ -26,7 +26,6 @@ use arch::{RegionType, layout};
use devices::ioapic;
#[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
use hypervisor::HypervisorVmError;
use libc::_SC_NPROCESSORS_ONLN;
use log::{debug, error, info, warn};
use serde::{Deserialize, Serialize};
use thiserror::Error;
@@ -2237,14 +2236,10 @@ impl MemoryManager {
}
fn get_prefault_num_threads(page_size: usize, num_pages: usize) -> usize {
let mut n: usize = 1;
// Do not create more threads than processors available.
// SAFETY: FFI call. Trivially safe.
let procs = unsafe { libc::sysconf(_SC_NPROCESSORS_ONLN) };
if procs > 0 {
n = cmp::min(procs as usize, MAX_PREFAULT_THREAD_COUNT);
}
let mut n = thread::available_parallelism()
.map_or(1, |val| val.get())
.min(MAX_PREFAULT_THREAD_COUNT);
// Do not create more threads than pages being allocated.
n = cmp::min(n, num_pages);