RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 06:37:35 +00:00
Code Issues Activity Actions

Kernel: Merge PurgeableVMObject into AnonymousVMObject

Browse source 
This implements memory commitments and lazy-allocation of committed
memory.
This commit is contained in:
Tom 2020-09-05 15:52:14 -06:00 • committed by Andreas Kling
parent b2a52f6208
commit 476f17b3f1
35 changed files with 937 additions and 564 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Kernel/Syscalls/mmap.cpp
View file

@ -29,7 +29,6 @@
#include <Kernel/Process.h>
#include <Kernel/VM/PageDirectory.h>
#include <Kernel/VM/PrivateInodeVMObject.h>
#include <Kernel/VM/PurgeableVMObject.h>
#include <Kernel/VM/Region.h>
#include <Kernel/VM/SharedInodeVMObject.h>
#include <LibC/limits.h>
@ -142,9 +141,10 @@ void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params)
}
if (map_anonymous) {
region = allocate_region(range.value(), !name.is_null() ? name : "mmap", prot, !map_noreserve);
auto strategy = map_noreserve ? AllocationStrategy::None : AllocationStrategy::Reserve;
region = allocate_region(range.value(), !name.is_null() ? name : "mmap", prot, strategy);
if (!region && (!map_fixed && addr != 0))
region = allocate_region(allocate_range({}, size), !name.is_null() ? name : "mmap", prot, !map_noreserve);
region = allocate_region(allocate_range({}, size), !name.is_null() ? name : "mmap", prot, strategy);
} else {
if (offset < 0)
return (void*)-EINVAL;
@ -280,7 +280,7 @@ int Process::sys$madvise(void* address, size_t size, int advice)
if (set_volatile && set_nonvolatile)
return -EINVAL;
if (set_volatile || set_nonvolatile) {
if (!region->vmobject().is_purgeable())
if (!region->vmobject().is_anonymous())
return -EPERM;
bool was_purged = false;
switch (region->set_volatile(VirtualAddress(address), size, set_volatile, was_purged)) {
@ -296,7 +296,7 @@ int Process::sys$madvise(void* address, size_t size, int advice)
return 0;
}
if (advice & MADV_GET_VOLATILE) {
if (!region->vmobject().is_purgeable())
if (!region->vmobject().is_anonymous())
return -EPERM;
return region->is_volatile(VirtualAddress(address), size) ? 0 : 1;
}