Skip to content

large page attributing an id on Linux.#42644

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
nodejs-github-bot merged 1 commit into from
Apr 17, 2022
Merged

large page attributing an id on Linux. #42644

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
21 changes: 21 additions & 0 deletions src/large_pages/node_large_page.cc
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -68,6 +68,11 @@
#ifndef _GNU_SOURCE
#define_GNU_SOURCE
#endif// ifndef _GNU_SOURCE
#include<sys/prctl.h>
#if !defined(PR_SET_VMA)
#definePR_SET_VMA0x53564d41
#definePR_SET_VMA_ANON_NAME0
#endif
#elif defined(__FreeBSD__)
#include"uv.h"// uv_exepath
#endif// defined(__linux__)
Expand DownExpand Up@@ -312,6 +317,21 @@ class MemoryMapPointer{
mem_ = nullptr;
size_ = 0;
}
staticvoidSetName(void* mem, size_t size, constchar* name){
#if defined(__linux__)
// Available since the 5.17 kernel release and if the
// CONFIG_ANON_VMA_NAME option, we can set an identifier
// to an anonymous mapped region. However if the kernel
// option is not present or it s an older kernel, it is a no-op.
if (mem != MAP_FAILED && mem != nullptr)
prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME,
reinterpret_cast<uintptr_t>(mem),
size,
reinterpret_cast<uintptr_t>(name));
#else
(void)name;
#endif
}
FORCE_INLINE ~MemoryMapPointer(){
if (mem_ == nullptr) return;
if (mem_ == MAP_FAILED) return;
Expand DownExpand Up@@ -382,6 +402,7 @@ MoveTextRegionToLargePages(const text_region& r){
#endif

if (mprotect(start, size, PROT_READ | PROT_EXEC) == -1) goto fail;
MemoryMapPointer::SetName(start, size, "nodejs Large Page");

// We need not `munmap(tmem, size)` on success.
tmem.Reset();
Expand Down