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Kernel: Make purgeable memory a VMObject level concept (again)
This patch changes the semantics of purgeable memory. - AnonymousVMObject now has a "purgeable" flag. It can only be set when constructing the object. (Previously, all anonymous memory was effectively purgeable.) - AnonymousVMObject now has a "volatile" flag. It covers the entire range of physical pages. (Previously, we tracked ranges of volatile pages, effectively making it a page-level concept.) - Non-volatile objects maintain a physical page reservation via the committed pages mechanism, to ensure full coverage for page faults. - When an object is made volatile, it relinquishes any unused committed pages immediately. If later made non-volatile again, we then attempt to make a new committed pages reservation. If this fails, we return ENOMEM to userspace. mmap() now creates purgeable objects if passed the MAP_PURGEABLE option together with MAP_ANONYMOUS. anon_create() memory is always purgeable.
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17 changed files with 189 additions and 1004 deletions
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@ -19,7 +19,7 @@ KResultOr<FlatPtr> Process::sys$purge(int mode)
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REQUIRE_NO_PROMISES;
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if (!is_superuser())
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return EPERM;
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int purged_page_count = 0;
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size_t purged_page_count = 0;
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if (mode & PURGE_ALL_VOLATILE) {
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NonnullRefPtrVector<AnonymousVMObject> vmobjects;
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{
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