diff options
Diffstat (limited to 'manual')
| -rw-r--r-- | manual/memory.texi | 32 |
1 files changed, 19 insertions, 13 deletions
diff --git a/manual/memory.texi b/manual/memory.texi index 5b14aa69b9..0c3d39efa8 100644 --- a/manual/memory.texi +++ b/manual/memory.texi @@ -683,25 +683,21 @@ parameter to be set, and @var{value} the new value to be set. Possible choices for @var{param}, as defined in @file{malloc.h}, are: @table @code -@item M_TRIM_THRESHOLD -This is the minimum size (in bytes) of the top-most, releasable chunk -that will cause @code{sbrk} to be called with a negative argument in -order to return memory to the system. -@item M_TOP_PAD -This parameter determines the amount of extra memory to obtain from the -system when a call to @code{sbrk} is required. It also specifies the -number of bytes to retain when shrinking the heap by calling @code{sbrk} -with a negative argument. This provides the necessary hysteresis in -heap size such that excessive amounts of system calls can be avoided. +@comment TODO: @item M_ARENA_MAX +@comment - Document ARENA_MAX env var. +@comment TODO: @item M_ARENA_TEST +@comment - Document ARENA_TEST env var. +@comment TODO: @item M_CHECK_ACTION +@item M_MMAP_MAX +The maximum number of chunks to allocate with @code{mmap}. Setting this +to zero disables all use of @code{mmap}. @item M_MMAP_THRESHOLD All chunks larger than this value are allocated outside the normal heap, using the @code{mmap} system call. This way it is guaranteed that the memory for these chunks can be returned to the system on @code{free}. Note that requests smaller than this threshold might still be allocated via @code{mmap}. -@item M_MMAP_MAX -The maximum number of chunks to allocate with @code{mmap}. Setting this -to zero disables all use of @code{mmap}. +@comment TODO: @item M_MXFAST @item M_PERTURB If non-zero, memory blocks are filled with values depending on some low order bits of this parameter when they are allocated (except when @@ -710,6 +706,16 @@ use of uninitialized or freed heap memory. Note that this option does not guarantee that the freed block will have any specific values. It only guarantees that the content the block had before it was freed will be overwritten. +@item M_TOP_PAD +This parameter determines the amount of extra memory to obtain from the +system when a call to @code{sbrk} is required. It also specifies the +number of bytes to retain when shrinking the heap by calling @code{sbrk} +with a negative argument. This provides the necessary hysteresis in +heap size such that excessive amounts of system calls can be avoided. +@item M_TRIM_THRESHOLD +This is the minimum size (in bytes) of the top-most, releasable chunk +that will cause @code{sbrk} to be called with a negative argument in +order to return memory to the system. @end table @end deftypefun |