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taskset: implement stride argument

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function                                             old     new   delta
taskset_main                                         925     986     +61

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2019-11-09 17:05:14 +01:00
parent 2f57b5139e
commit a82fb1b9d8
1 changed files with 10 additions and 5 deletions
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15
util-linux/taskset.c
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@ -121,10 +121,8 @@ static unsigned long *get_aff(int pid, unsigned *sz)
* Parse the CPU list and set the mask accordingly.
*
* The list element can be either a CPU index or a range of CPU indices.
* Example: "1,3,5-7".
*
* note1: stride (e.g. 0-255:2) is not supported
* note2: leading and trailing whitespace is not allowed
* Example: "1,3,5-7". Stride can be specified: "0-7:2" is "0,2,4,6".
* Note: leading and trailing whitespace is not allowed.
* util-linux 2.31 allows leading and sometimes trailing whitespace:
* ok: taskset -c ' 1, 2'
* ok: taskset -c ' 1 , 2'
@ -137,21 +135,28 @@ static void parse_cpulist(ul *mask, unsigned max, char *s)
char *aff = s;
for (;;) {
unsigned bit, end;
unsigned stride = 1;
bit = end = bb_strtou(s, &s, 10);
if (*s == '-') {
s++;
end = bb_strtou(s, &s, 10);
if (*s == ':') {
s++;
stride = bb_strtou(s, &s, 10);
}
}
if ((*s != ',' && *s != '\0')
|| bit > end
|| end == UINT_MAX /* bb_strtou returns this on malformed / ERANGE numbers */
|| stride == 0
|| stride == UINT_MAX
) {
bb_error_msg_and_die("bad affinity '%s'", aff);
}
while (bit <= end && bit < max) {
mask[bit / BITS_UL] |= (1UL << (bit & MASK_UL));
bit++;
bit += stride;
}
if (*s == '\0')
break;