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memusage.1: Add some text on table produced by memusage 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2014-09-01 17:14:10 +02:00
parent 26ae4cd949
commit 41deb515fd
1 changed files with 16 additions and 9 deletions
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man1/memusage.1
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@ -74,10 +74,12 @@ calls,
and sum of \fIlength\fR arguments of all
.BR mmap (2)
calls.
In a case of realloc, respectively mremap, if a new size of an original
malloc,
respectively mremap call is bigger than an old one,
sum of all such differences (new size - old size) is added.
In the case of
.BR realloc (3)
and
.BR mremap (2),
if the new size of an allocation is larger than the previous size,
the sum of all such differences (new size minus old size) is added.
.TP
.B "heap peak"
Maximum of all \fIsize\fR arguments of
@ -101,13 +103,18 @@ the difference from the base stack pointer computed.
The maximum of these differences is then the stack peak.
.RE
.PP
If
Immediately following this summary line, a table shows the number calls,
total memory allocated or deallocated,
and number of failed calls for each intercepted function.
The "realloc/total memory" of the table output by
.B memusage
does not reflect cases where
.BR realloc (3)
is used to reallocate a block of memory
to have a smaller size than previously,
total memory of realloc cell is not updated.
This can cause sum of all cells (excluding free) of total memory being
greater than free cell.
to have a smaller size than previously.
This can cause sum of all "total memory" cells (excluding "free")
to be larger than the "free/total memory" cell.
.SS Histogram for block sizes
The "Histogram for block sizes" provides a breakdown of memory
allocations into various bucket sizes.