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* Header refactoring: pages.h - unify and remove from catchall.David Goldblatt2017-04-251-0/+3
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* Use openat syscall if availableJim Chen2017-04-211-0/+3
| | | | | | | | | | Some architectures like AArch64 may not have the open syscall because it was superseded by the openat syscall, so check and use SYS_openat if SYS_open is not available. Additionally, Android headers for AArch64 define SYS_open to __NR_open, even though __NR_open is undefined. Undefine SYS_open in that case so SYS_openat is used.
* Support --with-lg-page values larger than system page size.Jason Evans2017-04-191-44/+138
| | | | | | | | | All mappings continue to be PAGE-aligned, even if the system page size is smaller. This change is primarily intended to provide a mechanism for supporting multiple page sizes with the same binary; smaller page sizes work better in conjunction with jemalloc's design. This resolves #467.
* Header refactoring: move assert.h out of the catch-allDavid Goldblatt2017-04-191-0/+1
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* Header refactoring: move malloc_io.h out of the catchallDavid Goldblatt2017-04-191-0/+2
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* Header refactoring: Split up jemalloc_internal.hDavid Goldblatt2017-04-111-1/+2
| | | | | | | | | | | | | | This is a biggy. jemalloc_internal.h has been doing multiple jobs for a while now: - The source of system-wide definitions. - The catch-all include file. - The module header file for jemalloc.c This commit splits up this functionality. The system-wide definitions responsibility has moved to jemalloc_preamble.h. The catch-all include file is now jemalloc_internal_includes.h. The module headers for jemalloc.c are now in jemalloc_internal_[externs|inlines|types].h, just as they are for the other modules.
* Propagate madvise() success/failure from pages_purge_lazy().Jason Evans2017-03-161-3/+3
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* Add alignment/size assertions to pages_*().Jason Evans2017-03-141-0/+15
| | | | | These sanity checks prevent what otherwise might result in failed system calls and unintended fallback execution paths.
* Fix pages_purge_forced() to discard pages on non-Linux systems.Jason Evans2017-03-141-1/+8
| | | | | madvise(..., MADV_DONTNEED) only causes demand-zeroing on Linux, so fall back to overlaying a new mapping.
* Replace tabs following #define with spaces.Jason Evans2017-01-211-1/+1
| | | | This resolves #564.
* Remove extraneous parens around return arguments.Jason Evans2017-01-211-18/+18
| | | | This resolves #540.
* Update brace style.Jason Evans2017-01-211-42/+43
| | | | | | | Add braces around single-line blocks, and remove line breaks before function-opening braces. This resolves #537.
* Remove leading blank lines from function bodies.Jason Evans2017-01-131-9/+0
| | | | This resolves #535.
* Refactor purging and splitting/merging.Jason Evans2016-12-271-21/+22
| | | | | | | | | | | | | | Split purging into lazy and forced variants. Use the forced variant for zeroing dss. Add support for NULL function pointers as an opt-out mechanism for the dalloc, commit, decommit, purge_lazy, purge_forced, split, and merge fields of extent_hooks_t. Add short-circuiting checks in large_ralloc_no_move_{shrink,expand}() so that no attempt is made if splitting/merging is not supported. This resolves #268.
* Add huge page configuration and pages_[no}huge().Jason Evans2016-12-271-1/+30
| | | | | | | | Add the --with-lg-hugepage configure option, but automatically configure LG_HUGEPAGE even if it isn't specified. Add the pages_[no]huge() functions, which toggle huge page state via madvise(..., MADV_[NO]HUGEPAGE) calls.
* Add --disable-syscall.Jason Evans2016-12-041-3/+3
| | | | This resolves #517.
* Refactor madvise(2) configuration.Jason Evans2016-11-171-5/+5
| | | | | | | | | Add feature tests for the MADV_FREE and MADV_DONTNEED flags to madvise(2), so that MADV_FREE is detected and used for Linux kernel versions 4.5 and newer. Refactor pages_purge() so that on systems which support both flags, MADV_FREE is preferred over MADV_DONTNEED. This resolves #387.
* Do not use syscall(2) on OS X 10.12 (deprecated).Jason Evans2016-11-031-3/+3
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* Use syscall(2) rather than {open,read,close}(2) during boot.Jason Evans2016-10-301-0/+19
| | | | | | | | | Some applications wrap various system calls, and if they call the allocator in their wrappers, unexpected reentry can result. This is not a general solution (many other syscalls are spread throughout the code), but this resolves a bootstrapping issue that is apparently common. This resolves #443.
* Close file descriptor after reading "/proc/sys/vm/overcommit_memory".Jason Evans2016-09-261-0/+1
| | | | | | | This bug was introduced by c2f970c32b527660a33fa513a76d913c812dcf7c (Modify pages_map() to support mapping uncommitted virtual memory.). This resolves #399.
* Modify pages_map() to support mapping uncommitted virtual memory.Jason Evans2016-05-061-18/+98
| | | | | | | | | | | If the OS overcommits: - Commit all mappings in pages_map() regardless of whether the caller requested committed memory. - Linux-specific: Specify MAP_NORESERVE to avoid unfortunate interactions with heuristic overcommit mode during fork(2). This resolves #193.
* Try to decommit new chunks.Jason Evans2015-08-121-1/+7
| | | | Always leave decommit disabled on non-Windows systems.
* Refactor arena_mapbits_{small,large}_set() to not preserve unzeroed.Jason Evans2015-08-111-1/+1
| | | | | Fix arena_run_split_large_helper() to treat newly committed memory as zeroed.
* Refactor arena_mapbits unzeroed flag management.Jason Evans2015-08-111-1/+1
| | | | | | Only set the unzeroed flag when initializing the entire mapbits entry, rather than mutating just the unzeroed bit. This simplifies the possible mapbits state transitions.
* Generalize chunk management hooks.Jason Evans2015-08-041-0/+167
Add the "arena.<i>.chunk_hooks" mallctl, which replaces and expands on the "arena.<i>.chunk.{alloc,dalloc,purge}" mallctls. The chunk hooks allow control over chunk allocation/deallocation, decommit/commit, purging, and splitting/merging, such that the application can rely on jemalloc's internal chunk caching and retaining functionality, yet implement a variety of chunk management mechanisms and policies. Merge the chunks_[sz]ad_{mmap,dss} red-black trees into chunks_[sz]ad_retained. This slightly reduces how hard jemalloc tries to honor the dss precedence setting; prior to this change the precedence setting was also consulted when recycling chunks. Fix chunk purging. Don't purge chunks in arena_purge_stashed(); instead deallocate them in arena_unstash_purged(), so that the dirty memory linkage remains valid until after the last time it is used. This resolves #176 and #201.
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