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Kernel: Provide consistent memory stats in ProcFS

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We should take the MM lock when gathering all the statistics that
we need so that the values are consistent.
This commit is contained in:
Tom 2021-01-04 20:40:38 -07:00 • committed by Andreas Kling
parent de6a4d49b8
commit d3e6cdf21f
2 changed files with 18 additions and 4 deletions
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20
Kernel/FileSystem/ProcFS.cpp
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@ -790,14 +790,26 @@ static bool procfs$memstat(InodeIdentifier, KBufferBuilder& builder)
kmalloc_stats stats;
get_kmalloc_stats(stats);
ScopedSpinLock mm_lock(s_mm_lock);
auto user_physical_pages_total = MM.user_physical_pages();
auto user_physical_pages_used = MM.user_physical_pages_used();
auto user_physical_pages_committed = MM.user_physical_pages_committed();
auto user_physical_pages_uncommitted = MM.user_physical_pages_uncommitted();
auto super_physical_total = MM.super_physical_pages();
auto super_physical_used = MM.super_physical_pages_used();
mm_lock.unlock();
JsonObjectSerializer<KBufferBuilder> json { builder };
json.add("kmalloc_allocated", stats.bytes_allocated);
json.add("kmalloc_available", stats.bytes_free);
json.add("kmalloc_eternal_allocated", stats.bytes_eternal);
json.add("user_physical_allocated", MM.user_physical_pages_used());
json.add("user_physical_available", MM.user_physical_pages() - MM.user_physical_pages_used());
json.add("super_physical_allocated", MM.super_physical_pages_used());
json.add("super_physical_available", MM.super_physical_pages() - MM.super_physical_pages_used());
json.add("user_physical_allocated", user_physical_pages_used);
json.add("user_physical_available", user_physical_pages_total - user_physical_pages_used);
json.add("user_physical_committed", user_physical_pages_committed);
json.add("user_physical_uncommitted", user_physical_pages_uncommitted);
json.add("super_physical_allocated", super_physical_used);
json.add("super_physical_available", super_physical_total - super_physical_used);
json.add("kmalloc_call_count", stats.kmalloc_call_count);
json.add("kfree_call_count", stats.kfree_call_count);
slab_alloc_stats([&json](size_t slab_size, size_t num_allocated, size_t num_free) {