openbsd/src/lib/libc/stdlib/malloc.c, branch OPENBSD_6_8_BASE

For page-sized and larger allocations do not put the pages we're

2020-09-06T06:41:03+00:00

shaving off into the cache but unamp them. Pages in the cache get re-used and then a future grow of the first allocation will be hampered. Also make realloc a no-op for small shrinkage. ok deraadt@

When system calls indicate an error they return -1, not some arbitrary

2019-06-28T13:35:02+00:00

value < 0. errno is only updated in this case. Change all (most?) callers of syscalls to follow this better, and let's see if this strictness helps us in the future.

Only override size of chunk if we're not given the actual length.

2019-05-23T06:43:18+00:00

Fixes malloc_conceal...freezero with malloc options C and/or G.

Inroduce malloc_conceal() and calloc_conceal(). Similar to their

2019-05-10T15:03:24+00:00

counterparts but return memory in pages marked MAP_CONCEAL and on free() freezero() is actually called.

Move default numer of pools in the multi-threaded case to 8. Various tests

2019-01-10T18:47:05+00:00

by me and others indicate that it is the optimum.

Make the "not my pool" searching loop a tiny bit smarter, while

2019-01-10T18:45:33+00:00

making the number of pools variable. Do not document the malloc conf settings atm, don't know yet if they will stay. Thanks to all the testers. ok deraadt@

Improve speed for the multi-threaded case by reducing lock contention.

2018-12-10T07:57:49+00:00

tested by many; ok florian@

style; OK otto

2018-12-09T11:32:02+00:00

Refactor "find the right pool" code into a function. ok djm@ tb@

2018-11-27T17:29:55+00:00

Introducing malloc_usable_size() was a mistake. While some other

2018-11-21T06:57:04+00:00

libs have it, it is a function that is considered harmful, so: Delete malloc_usable_size(). It is a function that blurs the line between malloc managed memory and application managed memory and exposes some of the internal workings of malloc. If an application relies on that, it is likely to break using another implementation of malloc. If you want usable size x, just allocate x bytes. ok deraadt@ and other devs