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* rts: Encapsulate block allocator spinlockBen Gamari2023-03-081-2/+2
| | | | | This makes it a bit easier to add instrumentation on this spinlock while debugging.
* rts: make it possible to change mblock size on 32-bit targetsCheng Shao2023-02-141-2/+1
| | | | | | | | The MBLOCK_SHIFT macro must be the single source of truth for defining the mblock size, and changing it should only affect performance, not correctness. This patch makes it truly possible to reconfigure mblock size, at least on 32-bit targets, by fixing places which implicitly relied on the previous MBLOCK_SHIFT constant. Fixes #22901.
* rts: Add missing const in HEAP_ALLOCED_GCBen Gamari2019-11-051-1/+1
| | | | | This was previously unnoticed as this code-path is hit on very few platforms (e.g. OpenBSD).
* Update Wiki URLs to point to GitLabTakenobu Tani2019-03-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | | This moves all URL references to Trac Wiki to their corresponding GitLab counterparts. This substitution is classified as follows: 1. Automated substitution using sed with Ben's mapping rule [1] Old: ghc.haskell.org/trac/ghc/wiki/XxxYyy... New: gitlab.haskell.org/ghc/ghc/wikis/xxx-yyy... 2. Manual substitution for URLs containing `#` index Old: ghc.haskell.org/trac/ghc/wiki/XxxYyy...#Zzz New: gitlab.haskell.org/ghc/ghc/wikis/xxx-yyy...#zzz 3. Manual substitution for strings starting with `Commentary` Old: Commentary/XxxYyy... New: commentary/xxx-yyy... See also !539 [1]: https://gitlab.haskell.org/bgamari/gitlab-migration/blob/master/wiki-mapping.json
* Typos [ci skip]Gabor Greif2017-06-131-1/+1
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* We define the `<XXX>_HOST_ARCH` to `1`, but never to `0`inMoritz Angermann2017-05-111-1/+1
| | | | | | | | | | | | | | | | | compiler/ghc.mk @echo "#define $(HostArch_CPP)_HOST_ARCH 1" >> $@ @echo "#define $(TargetArch_CPP)_HOST_ARCH 1" >> $@ this leads to warnigns like: > warning: 'x86_64_HOST_ARCH' is not defined, evaluates to 0 [-Wundef] Reviewers: austin, bgamari, erikd, simonmar Reviewed By: simonmar Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3555
* Prefer #if defined to #ifdefBen Gamari2017-04-281-1/+1
| | | | Our new CPP linter enforces this.
* cpp: Use #pragma once instead of #ifndef guardsBen Gamari2017-04-231-4/+1
| | | | | | | | | | | | | | This both says what we mean and silences a bunch of spurious CPP linting warnings. This pragma is supported by all CPP implementations which we support. Reviewers: austin, erikd, simonmar, hvr Reviewed By: simonmar Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3482
* rts: Make function pointer parameters `const` where possibleErik de Castro Lopo2016-05-121-2/+2
| | | | | | | | | | | | | | | | If a function takes a pointer parameter and doesn't update what the pointer points to, we can add `const` to the parameter declaration to document that no updates occur. Test Plan: Validate on Linux, OS X and Windows Reviewers: austin, Phyx, bgamari, simonmar, hsyl20 Reviewed By: bgamari, simonmar, hsyl20 Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2200
* rts: Replace `nat` with `uint32_t`Erik de Castro Lopo2016-05-051-2/+2
| | | | | | | | | | | | The `nat` type was an alias for `unsigned int` with a comment saying it was at least 32 bits. We keep the typedef in case client code is using it but mark it as deprecated. Test Plan: Validated on Linux, OS X and Windows Reviewers: simonmar, austin, thomie, hvr, bgamari, hsyl20 Differential Revision: https://phabricator.haskell.org/D2166
* rts: Make MBLOCK_SPACE_SIZE dynamicBen Gamari2015-10-301-15/+13
| | | | | | | | | | | | | | | | | | | | | | | Previously this was introduced in D524 as a compile-time constant. Sadly, this isn't flexible enough to allow for environments where ulimits restrict the maximum address space size (see, for instance, Consequently, we are forced to make this dynamic. In principle this shouldn't be so terrible as we can place both the beginning and end addresses within the same cache line, likely incurring only one or so additional instruction in HEAP_ALLOCED. Test Plan: validate Reviewers: austin, simonmar Reviewed By: simonmar Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1353 GHC Trac Issues: #10877
* RTS: Reduce MBLOCK_SPACE_SIZE on AArch64Erik de Castro Lopo2015-08-291-0/+5
| | | | | | | | | | | | | | | | | | | Commit 0d1a8d09f4 added a two step allocator for 64 bit systems. This allocator mmaps a huge (1 TB) chunk of memory out of which it does smaller allocations. On AArch64/Arm64 linux, this mmap was failing due to the Arm64 Linux kernel parameter CONFIG_ARM64_VA_BITS defaulting to 39 bits. Therefore reducing the AArch64 value for MBLOCK_SPACE_SIZE to make this allocation 1/4 TB while remaining 1 TB for other archs. Reviewers: ezyang, austin, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1171 GHC Trac Issues: #10682
* Two step allocator for 64-bit systemsGiovanni Campagna2015-07-221-0/+224
Summary: The current OS memory allocator conflates the concepts of allocating address space and allocating memory, which makes the HEAP_ALLOCED() implementation excessively complicated (as the only thing it cares about is address space layout) and slow. Instead, what we want is to allocate a single insanely large contiguous block of address space (to make HEAP_ALLOCED() checks fast), and then commit subportions of that in 1MB blocks as we did before. This is currently behind a flag, USE_LARGE_ADDRESS_SPACE, that is only enabled for certain OSes. Test Plan: validate Reviewers: simonmar, ezyang, austin Subscribers: thomie, carter Differential Revision: https://phabricator.haskell.org/D524 GHC Trac Issues: #9706
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