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* Backout 1.5 as requested by deischenJonathan Chen2007-05-221-1/+0
| | | | Notes: svn path=/head/; revision=169850
* __cleanup() is needed for ports/devel/valgrind, export it.Jonathan Chen2007-05-221-0/+1
| | | | Notes: svn path=/head/; revision=169847
* Back out all POSIXified *env() changes.Andrey A. Chernov2007-05-014-96/+41
| | | | | | | | | | | | Not because I admit they are technically wrong and not because of bug reports (I receive nothing). But because I surprisingly meets so strong opposition and resistance so lost any desire to continue that. Anyone who interested in POSIX can dig out what changes and how through cvs diffs. Notes: svn path=/head/; revision=169177
* Bump .DdAndrey A. Chernov2007-04-301-1/+1
| | | | | | | Suggested by: Henrik Brix Andersen <henrik@brixandersen.dk> Notes: svn path=/head/; revision=169146
* Add phraseAndrey A. Chernov2007-04-301-1/+2
| | | | | | | | "so altering the argument shall change the environment." into putenv description. Notes: svn path=/head/; revision=169142
* Make putenv() fully conforms to Open Group specs Issue 6Andrey A. Chernov2007-04-304-26/+58
| | | | | | | | | | | | | | (also IEEE Std 1003.1-2001) The specs explicitly says that altering passed string should change the environment, i.e. putenv() directly puts its arg into environment (unlike setenv() which just copies it there). It means that putenv() can't be implemented via setenv() (like we have before) at all. Putenv() value lives (allows modifying) up to the next putenv() or setenv() call. Notes: svn path=/head/; revision=169138
* Remove special case skipping initial '=' of the setenv() value "forAndrey A. Chernov2007-04-302-7/+0
| | | | | | | | | | | | compatibility with the different environment conventions" (man page). With the standards, we don't have them different anymore and IEEE Std 1003.1-2001 says that "The values that the environment variables may be assigned are not restricted except that they are considered to end with a null byte" Notes: svn path=/head/; revision=169111
* Make setenv, putenv, getenv and unsetenv conforming to Open Group specsAndrey A. Chernov2007-04-304-19/+48
| | | | | | | | | | | | Issue 6 (also IEEE Std 1003.1-2001) in following areas: args, return, errors. Putenv still needs rewriting because specs explicitly says that altering passed string later should change the environment (currently we copy the string so can't provide that). Notes: svn path=/head/; revision=169109
* Use C comments since we now preprocess these files with CPP.Daniel Eischen2007-04-291-2/+4
| | | | Notes: svn path=/head/; revision=169092
* Swap "underflow"/"overflow" in the table header.Ruslan Ermilov2007-04-101-2/+2
| | | | | | | | Submitted by: Ricardo Nabinger Sanchez MFC after: 3 days Notes: svn path=/head/; revision=168578
* Use size_t instead of unsigned for pagesize-related values, in order toJason Evans2007-03-291-4/+8
| | | | | | | | | | | | avoid downcasting issues. In particular, this change fixes posix_memalign(3) for alignments greater than 2^31 on LP64 systems. Make sure that NDEBUG is always set to be compatible with MALLOC_DEBUG. [1] Reported by: [1] Lee Hyo geol <hyogeollee@gmail.com> Notes: svn path=/head/; revision=168029
* Remove the run promotion/demotion machinery. Replace it with red-blackJason Evans2007-03-281-430/+219
| | | | | | | | | | | | | | | | | | | | | | | | | | trees that track all non-full runs for each bin. Use the red-black trees to be able to guarantee that each new allocation is placed in the lowest address available in any non-full run. This change completes the transition to allocating from low addresses in order to reduce the retention of sparsely used chunks. If the run in current use by a bin becomes empty, deallocate the run rather than retaining it for later use. The previous behavior had the tendency to spread empty runs across multiple chunks, thus preventing the release of chunks that were completely unused. Generalize base_chunk_alloc() (and rename it to base_pages_alloc()) to handle allocation sizes larger than the chunk size, so that it is possible to support chunk sizes that are smaller than an arena object. Reduce the minimum chunk size from 64kB to 8kB. Optimize tracking of addresses for deleted chunks. Fix a statistics bug for huge allocations. Notes: svn path=/head/; revision=168003
* Update the IMPLEMENTATION NOTES section to reflect recent mallocJason Evans2007-03-281-13/+30
| | | | | | | enhancements. Notes: svn path=/head/; revision=167969
* Add a HISTORY section.Jason Evans2007-03-281-0/+5
| | | | Notes: svn path=/head/; revision=167967
* Fix some subtle bugs for posix_memalign() having to do with integerJason Evans2007-03-241-18/+43
| | | | | | | | | | | rounding and overflow. Carefully document what the various overflow tests actually detect. The bugs mostly canceled out, such that the worst possible failure cases resulted in non-fatal over-allocations. Notes: svn path=/head/; revision=167872
* Fix posix_memalign() for large objects. Now that runs are extents ratherJason Evans2007-03-231-151/+297
| | | | | | | | | | | than binary buddies, the alignment guarantees are weaker, which requires a more complex aligned allocation algorithm, similar to that used for alignment greater than the chunk size. Reported by: matteo Notes: svn path=/head/; revision=167853
* Use extents rather than binary buddies to track free pages withinJason Evans2007-03-231-323/+332
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | chunks. This allows runs to be any multiple of the page size. The primary advantage is that large objects are no longer constrained to be 2^n pages, which can dramatically decrease internal fragmentation for large objects. This also allows the sizes for runs that back small objects to be more finely tuned. Free runs are searched for linearly using the chunk page map (with the help of some heuristic optimizations). This changes the allocation policy from "first best fit" to "first fit". A prototype red-black tree implementation for tracking free runs that implemented "first best fit" did not cause a measurable speed or memory usage difference for realistic chunk sizes (though of course it is possible to construct benchmarks that favor one allocation policy over another). Refine the handling of fullness constraints for small runs to be more tunable. Restructure the per chunk page map to contain only two fields per entry, rather than four. Also, increase each entry from 4 to 8 bytes, since it allows for 32-bit integers, without increasing the number of chunk header pages. Relax the maximum chunk size constraint. This is of no practical interest; it is merely fallout from the chunk page map restructuring. Revamp statistics gathering and reporting to be faster, clearer and more informative. Statistics gathering is fast enough now to have little to no impact on application speed, but it still requires approximately two extra pages of memory per arena (per process). This memory overhead may be acceptable for most systems, but we still need to leave statistics gathering disabled by default in RELENG branches. Rename NO_MALLOC_EXTRAS to MALLOC_PRODUCTION in order to make its intent clearer (i.e. it should be defined in RELENG branches). Notes: svn path=/head/; revision=167828
* Avoid using vsnprintf(3) unless MALLOC_STATS is defined, in order toJason Evans2007-03-201-152/+233
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | avoid substantial potential bloat for static binaries that do not otherwise use any printf(3)-family functions. [1] Rearrange arena_run_t so that the region bitmask can be minimally sized according to constraints related to each bin's size class. Previously, the region bitmask was the same size for all run headers, which wasted a measurable amount of memory. Rather than making runs for small objects as large as possible, make runs as small as possible such that header overhead stays below a certain bound. There are two exceptions that override the header overhead bound: 1) If the bound is impossible to honor, it is relaxed on a per-size-class basis. Since there is one bit of header overhead per object (plus a constant), it is impossible to achieve a header overhead less than or equal to 1/(# of bits per object). For the current setting of maximum 0.5% header overhead, this relaxation comes into play for {2, 4, 8, 16}-byte objects, for which header overhead is (on 64-bit systems) {7.1, 4.3, 2.2, 1.2}%, respectively. 2) There is still a cap on small run size, still set to 64kB. This comes into play for {1024, 2048}-byte objects, for which header overhead is {1.6, 3.1}%, respectively. In practice, this reduces the run sizes, which makes worst case low-water memory usage due to fragmentation less bad. It also reduces worst case high-water run fragmentation due to non-full runs, but this is only a constant improvement (most important to small short-lived processes). Reduce the default chunk size from 2MB to 1MB. Benchmarks indicate that the external fragmentation reduction makes 1MB the new sweet spot (as small as possible without adversely affecting performance). Reported by: [1] kientzle Notes: svn path=/head/; revision=167733
* Modify chunk_alloc() to prefer mmap()ed memory over sbrk()ed memory.Jason Evans2007-02-221-36/+40
| | | | | | | | | | | | | | This has no impact unless USE_BRK is defined (32-bit platforms), in which case user allocations are allocated via mmap() if at all possible, in order to avoid the possibility of unreclaimable chunks in the data segment. Fix an obscure bug in base_alloc() that could have allowed undefined behavior if an application were to use sbrk() in conjunction with a USE_BRK-enabled malloc. Notes: svn path=/head/; revision=166890
* Fix a utrace(2)-related bug in calloc(3).Jason Evans2007-01-311-44/+56
| | | | | | | | | Integrate various pedantic cleanups. Submitted by: Andrew Doran <ad@netbsd.org> Notes: svn path=/head/; revision=166375
* Per Regents of the University of Calfornia letter, remove advertisingWarner Losh2007-01-0958-232/+0
| | | | | | | | | clause. # If I've done so improperly on a file, please let me know. Notes: svn path=/head/; revision=165903
* Implement chunk allocation/deallocation hysteresis by caching one spareJason Evans2006-12-231-51/+86
| | | | | | | | | | | chunk per arena, rather than immediately deallocating all unused chunks. This fixes a potential performance issue when allocating/deallocating an object of size (4kB..1MB] in a loop. Reported by: davidxu Notes: svn path=/head/; revision=165473
* Note that the value from getenv() should not be modified by applications.Tom Rhodes2006-10-121-1/+5
| | | | | | | | PR: 60544 Reviewed by: ru Notes: svn path=/head/; revision=163262
* getenv.3: Put "is" on a line with other wordsTom Rhodes2006-10-071-2/+1
| | | | | | | | | | | getobjformat.3: "takes precedence over" is not an envrionment variable. PR: 75545 Submitted by: n-kogane@syd.odn.ne.jp MFC after: 3 days Notes: svn path=/head/; revision=163108
* Revise markup in recently added manpages.Ruslan Ermilov2006-09-303-43/+48
| | | | Notes: svn path=/head/; revision=162841
* Keep compatible parts in sync with OpenBSD v1.21, add some comments.Andrey A. Chernov2006-09-231-15/+7
| | | | | | | No functional changes. Notes: svn path=/head/; revision=162574
* Remove code #ifndef'ed in prev. commit to stay in sync with OpenBSDAndrey A. Chernov2006-09-221-12/+0
| | | | | | | v1.21 which just do that. Notes: svn path=/head/; revision=162557
* Be more GNU compatible:Andrey A. Chernov2006-09-221-2/+5
| | | | | | | | | don't be greedy on the GNU "::" extension when arg separated by whitespace and POSIX_CORRECTLY is set. From POSIX point of view this is unclear situation, so minimal assumption looks right. Notes: svn path=/head/; revision=162555
* Markup fixes.Ruslan Ermilov2006-09-171-51/+51
| | | | Notes: svn path=/head/; revision=162385
* Change the way base allocation is done for internal malloc dataJason Evans2006-09-081-56/+93
| | | | | | | | | | structures, in order to avoid the possibility of attempted recursive lock acquisition for chunks_mtx. Reported by: Slawa Olhovchenkov <slw@zxy.spb.ru> Notes: svn path=/head/; revision=162163
* alloca() cannot check if the allocation is valid; mention the consequences.Ruslan Ermilov2006-09-051-4/+13
| | | | | | | Obtained from: OpenBSD Notes: svn path=/head/; revision=162040
* Enable TLS on PowerPC.Marcel Moolenaar2006-09-011-1/+0
| | | | Notes: svn path=/head/; revision=161831
* Enable TLS on ia64.Marcel Moolenaar2006-09-011-1/+0
| | | | Notes: svn path=/head/; revision=161803
* Correctly handle the case in calloc(num, size) whereColin Percival2006-08-131-1/+1
| | | | | | | | | | | | | | (size_t)(num * size) == 0 but both num and size are nonzero. Reported by: Ilja van Sprundel Approved by: jasone Security: Integer overflow; calloc was allocating 1 byte in response to a request for a multiple of 2^32 (or 2^64) bytes instead of returning NULL. Notes: svn path=/head/; revision=161263
* Define NO_TLS on PowerPC.Marcel Moolenaar2006-08-091-0/+1
| | | | | | | See also: PR ia64/91846 Notes: svn path=/head/; revision=161131
* Conditionally expand the size_invs lookup table in arena_run_reg_dalloc()Jason Evans2006-07-271-1/+12
| | | | | | | | | | | so that architectures with a quantum of 8 (rather than 16) work. Restore arm's quantum to 8. Submitted by: jmg Notes: svn path=/head/; revision=160761
* Use 4 as QUANTUM_2POW_MIN on arm as it is on any other architecture, to avoidOlivier Houchard2006-07-271-1/+1
| | | | | | | triggering an assertion later. Notes: svn path=/head/; revision=160751
* Fix cpp logic in arena_malloc() to adjust size when assertions are enabled,Jason Evans2006-07-271-23/+19
| | | | | | | | | | | even if stats gathering is disabled. [1] Remove 'size' parameter from several functions that do not use it. Reported by: [1] ache Notes: svn path=/head/; revision=160736
* Use some math tricks in arena_run_reg_dalloc() to avoid actual division, asJason Evans2006-07-011-83/+90
| | | | | | | | | | | | | | | | | | | | well as avoiding a switch statement. This change has no significant impact to performance when branch prediction is successful at predicting the sizes of objects passed to free(), but in the case that the object sizes are semi-random, this change has the potential to prevent many branch prediction misses, thus improving performance substantially. Take advantage of alignment guarantees in ipalloc(), and pad object sizes to something less than a power of two when possible. This has the potential to substantially reduce internal fragmentation for objects allocated via posix_memalign(). Avoid an unnecessary pow2_ceil() call in arena_ralloc(). Submitted by: djam8193ah@hotmail.com Notes: svn path=/head/; revision=160066
* Make the behavior of malloc(0) standards-compliant by getting rid of nil,Jason Evans2006-06-301-48/+46
| | | | | | | | | | | | and instead creating a small allocation for each malloc(0) call. The optional SysV compatibility behavior remains unchanged. Add a couple of assertions. Fix a couple of typos in error message strings. Notes: svn path=/head/; revision=160055
* twalk() expects an `action' function not a comparison function.Giorgos Keramidas2006-06-231-1/+1
| | | | | | | | | | | | The text is correct in the "DESCRIPTION" section, so fix "SYNOPSIS" to use the correct name. PR: docs/90498 Submitted by: Vasil Dimov MFC after: 3 days Notes: svn path=/head/; revision=159879
* Add a missing case for the switch statement in arena_run_reg_dalloc(). [1]Jason Evans2006-06-201-8/+20
| | | | | | | | | | Fix a leak in chunk_dealloc(). [2] Reported by: [1] djam8193ah@hotmail.com, [2] Ville-Pertti Keinonen <will@exomi.com> Notes: svn path=/head/; revision=159798
* o .Xr strtonum(3).Maxim Konovalov2006-05-202-0/+2
| | | | | | | MFC after: 1 week Notes: svn path=/head/; revision=158774
* Correct decoding a string containing '/'.Jung-uk Kim2006-05-191-1/+1
| | | | | | | | PR: 97485 Submitted by: Mikko Tyolajarvi < mbsd at pacbell dot net > Notes: svn path=/head/; revision=158749
* Increase the minimum chunk size by a power of two (32kB --> 64kB, assumingJason Evans2006-05-101-2/+2
| | | | | | | | | | | 4kB pages), in order to avoid dangerous rounding error when calculating fullness limits during run promotion/demotion. Convert a structure bitfield to a normal field in areana_run_t. This should have been changed along with the other fields in revision 1.120. Notes: svn path=/head/; revision=158383
* Change the semantics of brk_max to dynamically deal with data segmentJason Evans2006-04-271-71/+83
| | | | | | | | | | | | | | | | | | bounds. [1] Modify logic for utilizing the data segment, such that it is possible to create huge allocations there. Shrink the data segment when deallocating a chunk, if it is at the end of the data segment. Rename chunk_size to csize in huge_malloc(), in order to avoid masking a static variable of the same name. [1] Reported by: Paul Allen <nospam@ugcs.caltech.edu> Notes: svn path=/head/; revision=158062
* s/soley/solelyJens Schweikhardt2006-04-131-1/+1
| | | | Notes: svn path=/head/; revision=157735
* Add an unreachable return statement, in order to avoid a compiler warningJason Evans2006-04-051-0/+1
| | | | | | | | | for non-standard optimization levels. Reported by: Michael Zach <zach@webges.com> Notes: svn path=/head/; revision=157539
* Only initialize the first per-chunk page map element for free runs. ThisJason Evans2006-04-051-31/+16
| | | | | | | makes run split/coalesce operations of complexity lg(n) rather than n. Notes: svn path=/head/; revision=157532
* Add malloc_usable_size() to the RETURN VALUES section.Jason Evans2006-04-041-1/+6
| | | | Notes: svn path=/head/; revision=157508
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