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ProcFS: Expose the physical page map of each region in /proc/PID/vm

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You can now see the state of each underlying physical page slot in a
VM region.
This commit is contained in:
Andreas Kling 2020-02-25 21:38:03 +01:00
parent 24b5fd4c4c
commit 7f9a86b495
Notes: sideshowbarker 2024-07-19 09:03:41 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/7f9a86b4959
1 changed files with 14 additions and 0 deletions
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14
Kernel/FileSystem/ProcFS.cpp
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@ -315,6 +315,20 @@ Optional<KBuffer> procfs$pid_vm(InodeIdentifier identifier)
region_object.add("amount_dirty", (u32)region.amount_dirty());
region_object.add("cow_pages", region.cow_pages());
region_object.add("name", region.name());
StringBuilder pagemap_builder;
for (size_t i = 0; i < region.page_count(); ++i) {
auto page_index = region.first_page_index() + i;
auto& physical_page_slot = region.vmobject().physical_pages()[page_index];
if (!physical_page_slot)
pagemap_builder.append('N');
else if (physical_page_slot == MM.shared_zero_page())
pagemap_builder.append('Z');
else
pagemap_builder.append('P');
}
region_object.add("pagemap", pagemap_builder.to_string());
}
array.finish();
return builder.build();