mirrors/Astral
1
0
Fork 0
mirror of https://github.com/Mathewnd/Astral.git synced 2026-10-27 12:48:22 +00:00
Code Issues Packages Projects Releases Wiki Activity

vmm: reduce number of page faults on anonymous page in

Browse Source
This commit is contained in:
Matheus
2026-04-17 20:48:45 -03:00
parent 3dfb6b5a8c
commit e121029500
1 changed files with 25 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel-src/mm/vmm.c
+25 -7
View File
@@ -639,14 +639,32 @@ bool vmm_pagefault(void *addr, bool user, int actions) {
}
}
} else {
// anonymous memory. map the zero'd page
status = arch_mmu_map(current_vmm_context()->pagetable, zeropage, addr, range->mmuflags & ~ARCH_MMU_FLAGS_WRITE);
if (!status) {
printf("vmm: out of memory to map zero page into address space (sending SIGBUS)\n");
signal_signalthread(current_thread(), SIGBUS, true);
status = true;
status = true;
// anonymous memory.
if (range->mmuflags & ARCH_MMU_FLAGS_WRITE) {
// writeable range: allocate a new page, zero it and map it
void *new_page = pmm_allocpage(PMM_SECTION_DEFAULT);
if (new_page == NULL) {
printf("vmm: out of memory to allocate page to satisfy anonymous page-in (sending SIGBUS)\n");
signal_signalthread(current_thread(), SIGBUS, true);
goto cleanup;
}
memset(MAKE_HHDM(new_page), 0, PAGE_SIZE);
if (!arch_mmu_map(current_vmm_context()->pagetable, new_page, addr, range->mmuflags)) {
printf("vmm: out of memory to map page (sending SIGBUS)\n");
signal_signalthread(current_thread(), SIGBUS, true);
pmm_release(new_page);
}
} else {
pmm_hold(zeropage);
// read-only range: map a shared zero page
if (!arch_mmu_map(current_vmm_context()->pagetable, zeropage, addr, range->mmuflags)) {
printf("vmm: out of memory to map zero page into address space (sending SIGBUS)\n");
signal_signalthread(current_thread(), SIGBUS, true);
} else {
pmm_hold(zeropage);
}
}
}
} else if (arch_mmu_iswritable(current_vmm_context()->pagetable, addr) == false) {