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manual: Sort mallopt M_* parameters alphabetically 

Sort the mallopt M_* parameters alphabetically and add comments for the
missing paramters.
This commit is contained in:
Carlos O'Donell 2013-03-17 16:03:02 -04:00
parent 280ea923be
commit ec4ff04d23
2 changed files with 24 additions and 13 deletions
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@ -1,3 +1,8 @@
2013-03-17 Carlos O'Donell <carlos@redhat.com>
* manual/memory.texi (Malloc Tunable Parameters):
Sort parameters alphabetically. Add comments for missing entries.
2013-03-17 David S. Miller <davem@davemloft.net>
* sysdeps/sparc/fpu/libm-test-ulps: Update.

32
manual/memory.texi
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@ -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