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//===-- common.h ------------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef SCUDO_RSS_LIMIT_CHECKER_H_
#define SCUDO_RSS_LIMIT_CHECKER_H_
#include "atomic_helpers.h"
#include "common.h"
#include "internal_defs.h"
namespace scudo {
class RssLimitChecker {
public:
enum RssLimitExceeded {
Neither,
Soft,
Hard,
};
void init(int SoftRssLimitMb, int HardRssLimitMb) {
CHECK_GE(SoftRssLimitMb, 0);
CHECK_GE(HardRssLimitMb, 0);
this->SoftRssLimitMb = static_cast<uptr>(SoftRssLimitMb);
this->HardRssLimitMb = static_cast<uptr>(HardRssLimitMb);
}
// Opportunistic RSS limit check. This will update the RSS limit status, if
// it can, every 250ms, otherwise it will just return the current one.
RssLimitExceeded getRssLimitExceeded() {
if (!HardRssLimitMb && !SoftRssLimitMb)
return RssLimitExceeded::Neither;
u64 NextCheck = atomic_load_relaxed(&RssNextCheckAtNS);
u64 Now = getMonotonicTime();
if (UNLIKELY(Now >= NextCheck))
check(NextCheck);
return static_cast<RssLimitExceeded>(atomic_load_relaxed(&RssLimitStatus));
}
uptr getSoftRssLimit() const { return SoftRssLimitMb; }
uptr getHardRssLimit() const { return HardRssLimitMb; }
private:
void check(u64 NextCheck);
uptr SoftRssLimitMb = 0;
uptr HardRssLimitMb = 0;
atomic_u64 RssNextCheckAtNS = {};
atomic_u8 RssLimitStatus = {};
};
} // namespace scudo
#endif // SCUDO_RSS_LIMIT_CHECKER_H_
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