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Only COW on fault if the physical page has retain_count > 1.

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This makes COW pages lazily-but-transparently revert back to read/write.
This commit is contained in:
Andreas Kling
2018-11-05 14:10:18 +01:00
parent 2d045d2a64
commit 9e62eb4856
Notes: sideshowbarker 2024-07-19 18:33:36 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/9e62eb48566
4 changed files with 17 additions and 2 deletions
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5
Kernel/ProcFileSystem.cpp
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@@ -61,9 +61,10 @@ ByteBuffer procfs$pid_vm(Process& process)
region->name.characters());
for (size_t i = 0; i < region->physical_pages.size(); ++i) {
auto& physical_page = region->physical_pages[i];
ptr += ksprintf(ptr, "P%x%s ",
ptr += ksprintf(ptr, "P%x%s(%u) ",
physical_page ? physical_page->paddr().get() : 0,
region->cow_map.get(i) ? "!" : ""
region->cow_map.get(i) ? "!" : "",
physical_page->retain_count()
);
}
ptr += ksprintf(ptr, "\n");