tree da274f8b04d02548e0fe7c1e1bf35579d4639e7c
parent 207e887e9e791e5861c9830f567120e62747a3ac
author Kostya Kortchinsky <kostyak@google.com> 1595866422 -0700
committer Copybara-Service <copybara-worker@google.com> 1598597962 -0700

[scudo][standalone] mallopt runtime configuration options

Summary:
Partners have requested the ability to configure more parts of Scudo
at runtime, notably the Secondary cache options (maximum number of
blocks cached, maximum size) as well as the TSD registry options
(the maximum number of TSDs in use).

This CL adds a few more Scudo specific `mallopt` parameters that are
passed down to the various subcomponents of the Combined allocator.

- `M_CACHE_COUNT_MAX`: sets the maximum number of Secondary cached items
- `M_CACHE_SIZE_MAX`: sets the maximum size of a cacheable item in the Secondary
- `M_TSDS_COUNT_MAX`: sets the maximum number of TSDs that can be used (Shared Registry only)

Regarding the TSDs maximum count, this is a one way option, only
allowing to increase the count.

In order to allow for this, I rearranged the code to have some `setOption`
member function to the relevant classes, using the `scudo::Option` class
enum to determine what is to be set.

This also fixes an issue where a static variable (`Ready`) was used in
templated functions without being set back to `false` every time.

Reviewers: pcc, eugenis, hctim, cferris

Subscribers: jfb, llvm-commits, #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D84667

GitOrigin-RevId: 6f00f3b56e5a13286142facd929be15ab7b17aa3