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mallinfo.3: The 'usmblks' is nowadays always 0 

Verified from the course code.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2020-10-17 18:19:16 +02:00
parent 7e35a02866
commit 70fd3c08d3
1 changed files with 6 additions and 4 deletions
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10
man3/mallinfo.3
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@ -53,7 +53,7 @@ struct mallinfo {
int smblks; /* Number of free fastbin blocks */
int hblks; /* Number of mmapped regions */
int hblkhd; /* Space allocated in mmapped regions (bytes) */
int usmblks; /* Maximum total allocated space (bytes) */
int usmblks; /* See below */
int fsmblks; /* Space in freed fastbin blocks (bytes) */
int uordblks; /* Total allocated space (bytes) */
int fordblks; /* Total free space (bytes) */
@ -92,9 +92,11 @@ The number of bytes in blocks currently allocated using
.BR mmap (2).
.TP
.I usmblks
The "highwater mark" for allocated space\(emthat is,
the maximum amount of space that was ever allocated.
This field is maintained only in nonthreading environments.
This field is unused, and is always 0.
.\" It seems to have been zero since at least as far back as glibc 2.15
Historically, it was the "highwater mark" for allocated space\(emthat is,
the maximum amount of space that was ever allocated (in bytes);
this field was maintained only in nonthreading environments.
.TP
.I fsmblks
The total number of bytes in fastbin free blocks.