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Add basic zero faults.

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mmap() will now map uncommitted pages that get allocated and zeroed upon the
first access. I also made /proc/PID/vm show number of "committed" bytes in
each region. This is so cool! :^)
This commit is contained in:
Andreas Kling 2018-11-19 02:17:20 +01:00
parent e88f306d07
commit 629c5be10b
5 changed files with 42 additions and 7 deletions
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3
Kernel/MemoryManager.h
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@ -132,6 +132,8 @@ public:
int commit(Process&);
int decommit(Process&);
size_t committed() const;
LinearAddress linearAddress;
size_t size { 0 };
size_t m_offset_in_vmo { 0 };
@ -209,6 +211,7 @@ private:
bool copy_on_write(Process&, Region&, unsigned page_index_in_region);
bool page_in_from_vnode(PageDirectory&, Region&, unsigned page_index_in_region);
bool zero_page(PageDirectory&, Region& region, unsigned page_index_in_region);
byte* quickmap_page(PhysicalPage&);
void unquickmap_page();