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Nuthatch AgentandChris Kennelly
98af14cd99
Increment the hard-limit hit counter in `PageAllocator::ShrinkToUsageLimitSlow` when backed memory is below the hard limit at entry, crosses the hard limit while the page heap lock is dropped during soft-limit release, and then triggers a hard-limit shrink. Previously, the hard-limit hit counter was only updated before the unlocked soft-limit shrink, whereas a subsequent hard-limit shrink incremented the successful-shrink counter afterward. That mismatch could leave successful hard-limit shrinks greater than total hard-limit hits and trip the statistics assertion in `PageAllocator::limit_hits`. Co-authored-by: Chris Kennelly <ckennelly@google.com> PiperOrigin-RevId: 1007121442
TCMalloc
This repository contains the TCMalloc C++ code.
TCMalloc is Google's customized implementation of C's malloc() and C++'s
operator new used for memory allocation within our C and C++ code. TCMalloc is
a fast, multi-threaded malloc implementation.
Building TCMalloc
Bazel is the official build system for TCMalloc. Experimental support for CMake is available as well.
The TCMalloc Platforms Guide contains information on platform support for TCMalloc.
Documentation
All users of TCMalloc should consult the following documentation resources:
- The TCMalloc Quickstart covers downloading, installing, building, and testing TCMalloc, including incorporating within your codebase.
- The TCMalloc Overview covers the basic architecture of TCMalloc, and how that may affect configuration choices.
- The TCMalloc Reference covers the C and C++ TCMalloc API endpoints.
More advanced usages of TCMalloc may find the following documentation useful:
- The TCMalloc Tuning Guide covers the configuration choices in more depth, and also illustrates other ways to customize TCMalloc. This also covers important operating system-level properties for improving TCMalloc performance.
- The TCMalloc Design Doc covers how TCMalloc works underneath the hood, and why certain design choices were made. Most developers will not need this level of implementation detail.
- The TCMalloc Compatibility Guide which documents our expectations for how our APIs are used.
License
The TCMalloc library is licensed under the terms of the Apache license. See LICENSE for more information.
Disclaimer: This is not an officially supported Google product.