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Backport #63730 to 24.3: Userspace page cache: don't collect stats if cache is unused

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robot-clickhouse 2024-05-14 09:05:31 +00:00
parent db75a12c99
commit 660f084543
1 changed files with 7 additions and 1 deletions
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8
src/Common/PageCache.cpp
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@ -198,12 +198,18 @@ size_t PageCache::getPinnedSize() const
PageCache::MemoryStats PageCache::getResidentSetSize() const
{
MemoryStats stats;
#ifdef OS_LINUX
if (use_madv_free)
{
std::unordered_set<UInt64> cache_mmap_addrs;
{
std::lock_guard lock(global_mutex);
/// Don't spend time on reading smaps if page cache is not used.
if (mmaps.empty())
return stats;
for (const auto & m : mmaps)
cache_mmap_addrs.insert(reinterpret_cast<UInt64>(m.ptr));
}
@ -258,7 +264,7 @@ PageCache::MemoryStats PageCache::getResidentSetSize() const
UInt64 addr = unhexUInt<UInt64>(s.c_str());
current_range_is_cache = cache_mmap_addrs.contains(addr);
}
else if (s == "Rss:" || s == "LazyFree")
else if (s == "Rss:" || s == "LazyFree:")
{
skip_whitespace();
size_t val;