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systemd/0283-shared-cpu-set-util-introduce-cpu_set_to_range.patch

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From 93777a6dd8c12d5cba094694bf7ed6e8c06c2d6d Mon Sep 17 00:00:00 2001
From: Michal Sekletar <msekleta@redhat.com>
Date: Thu, 23 May 2019 14:27:18 +0200
Subject: [PATCH] shared/cpu-set-util: introduce cpu_set_to_range()
(cherry picked from commit 71b28519b55b496237146f9bcb5a627455f15f7e)
Related: #1734787
---
src/basic/cpu-set-util.c | 37 ++++++++++++++++++++++++++
src/basic/cpu-set-util.h | 2 ++
src/test/test-cpu-set-util.c | 50 ++++++++++++++++++++++++++++++++++++
3 files changed, 89 insertions(+)
diff --git a/src/basic/cpu-set-util.c b/src/basic/cpu-set-util.c
index 74e35e57dd..bff39ec143 100644
--- a/src/basic/cpu-set-util.c
+++ b/src/basic/cpu-set-util.c
@@ -37,6 +37,43 @@ char* cpu_set_to_string(const CPUSet *a) {
return TAKE_PTR(str) ?: strdup("");
}
+char *cpu_set_to_range_string(const CPUSet *set) {
+ unsigned range_start = 0, range_end;
+ _cleanup_free_ char *str = NULL;
+ size_t allocated = 0, len = 0;
+ bool in_range = false;
+ int r;
+
+ for (unsigned i = 0; i < set->allocated * 8; i++)
+ if (CPU_ISSET_S(i, set->allocated, set->set)) {
+ if (in_range)
+ range_end++;
+ else {
+ range_start = range_end = i;
+ in_range = true;
+ }
+ } else if (in_range) {
+ in_range = false;
+
+ if (!GREEDY_REALLOC(str, allocated, len + 2 + 2 * DECIMAL_STR_MAX(unsigned)))
+ return NULL;
+
+ r = sprintf(str + len, len > 0 ? " %d-%d" : "%d-%d", range_start, range_end);
+ assert_se(r > 0);
+ len += r;
+ }
+
+ if (in_range) {
+ if (!GREEDY_REALLOC(str, allocated, len + 2 + 2 * DECIMAL_STR_MAX(int)))
+ return NULL;
+
+ r = sprintf(str + len, len > 0 ? " %d-%d" : "%d-%d", range_start, range_end);
+ assert_se(r > 0);
+ }
+
+ return TAKE_PTR(str) ?: strdup("");
+}
+
int cpu_set_realloc(CPUSet *cpu_set, unsigned ncpus) {
size_t need;
diff --git a/src/basic/cpu-set-util.h b/src/basic/cpu-set-util.h
index 415c6ca295..ec640b2ec9 100644
--- a/src/basic/cpu-set-util.h
+++ b/src/basic/cpu-set-util.h
@@ -25,7 +25,9 @@ static inline void cpu_set_reset(CPUSet *a) {
int cpu_set_add_all(CPUSet *a, const CPUSet *b);
char* cpu_set_to_string(const CPUSet *a);
+char *cpu_set_to_range_string(const CPUSet *a);
int cpu_set_realloc(CPUSet *cpu_set, unsigned ncpus);
+
int parse_cpu_set_full(
const char *rvalue,
CPUSet *cpu_set,
diff --git a/src/test/test-cpu-set-util.c b/src/test/test-cpu-set-util.c
index cae51ad7d9..0d2741cd43 100644
--- a/src/test/test-cpu-set-util.c
+++ b/src/test/test-cpu-set-util.c
@@ -4,6 +4,7 @@
#include "alloc-util.h"
#include "cpu-set-util.h"
+#include "string-util.h"
#include "macro.h"
static void test_parse_cpu_set(void) {
@@ -13,6 +14,22 @@ static void test_parse_cpu_set(void) {
log_info("/* %s */", __func__);
+ /* Single value */
+ assert_se(parse_cpu_set_full("0", &c, true, NULL, "fake", 1, "CPUAffinity") >= 0);
+ assert_se(c.set);
+ assert_se(c.allocated >= sizeof(__cpu_mask) / 8);
+ assert_se(CPU_ISSET_S(0, c.allocated, c.set));
+ assert_se(CPU_COUNT_S(c.allocated, c.set) == 1);
+
+ assert_se(str = cpu_set_to_string(&c));
+ log_info("cpu_set_to_string: %s", str);
+ str = mfree(str);
+ assert_se(str = cpu_set_to_range_string(&c));
+ log_info("cpu_set_to_range_string: %s", str);
+ assert_se(streq(str, "0-0"));
+ str = mfree(str);
+ cpu_set_reset(&c);
+
/* Simple range (from CPUAffinity example) */
assert_se(parse_cpu_set_full("1 2", &c, true, NULL, "fake", 1, "CPUAffinity") >= 0);
assert_se(c.set);
@@ -24,6 +41,10 @@ static void test_parse_cpu_set(void) {
assert_se(str = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", str);
str = mfree(str);
+ assert_se(str = cpu_set_to_range_string(&c));
+ log_info("cpu_set_to_range_string: %s", str);
+ assert_se(streq(str, "1-2"));
+ str = mfree(str);
cpu_set_reset(&c);
/* A more interesting range */
@@ -34,9 +55,14 @@ static void test_parse_cpu_set(void) {
assert_se(CPU_ISSET_S(cpu, c.allocated, c.set));
for (cpu = 8; cpu < 12; cpu++)
assert_se(CPU_ISSET_S(cpu, c.allocated, c.set));
+
assert_se(str = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", str);
str = mfree(str);
+ assert_se(str = cpu_set_to_range_string(&c));
+ log_info("cpu_set_to_range_string: %s", str);
+ assert_se(streq(str, "0-3 8-11"));
+ str = mfree(str);
cpu_set_reset(&c);
/* Quoted strings */
@@ -48,6 +74,10 @@ static void test_parse_cpu_set(void) {
assert_se(str = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", str);
str = mfree(str);
+ assert_se(str = cpu_set_to_range_string(&c));
+ log_info("cpu_set_to_range_string: %s", str);
+ assert_se(streq(str, "8-11"));
+ str = mfree(str);
cpu_set_reset(&c);
/* Use commas as separators */
@@ -72,6 +102,10 @@ static void test_parse_cpu_set(void) {
assert_se(str = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", str);
str = mfree(str);
+ assert_se(str = cpu_set_to_range_string(&c));
+ log_info("cpu_set_to_range_string: %s", str);
+ assert_se(streq(str, "0-7"));
+ str = mfree(str);
cpu_set_reset(&c);
/* Ranges */
@@ -98,6 +132,10 @@ static void test_parse_cpu_set(void) {
assert_se(str = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", str);
str = mfree(str);
+ assert_se(str = cpu_set_to_range_string(&c));
+ log_info("cpu_set_to_range_string: %s", str);
+ assert_se(streq(str, "0-3 8-11"));
+ str = mfree(str);
cpu_set_reset(&c);
/* Negative range (returns empty cpu_set) */
@@ -115,6 +153,10 @@ static void test_parse_cpu_set(void) {
assert_se(str = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", str);
str = mfree(str);
+ assert_se(str = cpu_set_to_range_string(&c));
+ log_info("cpu_set_to_range_string: %s", str);
+ assert_se(streq(str, "0-11"));
+ str = mfree(str);
cpu_set_reset(&c);
/* Mix ranges and individual CPUs */
@@ -128,6 +170,10 @@ static void test_parse_cpu_set(void) {
assert_se(str = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", str);
str = mfree(str);
+ assert_se(str = cpu_set_to_range_string(&c));
+ log_info("cpu_set_to_range_string: %s", str);
+ assert_se(streq(str, "0-1 4-11"));
+ str = mfree(str);
cpu_set_reset(&c);
/* Garbage */
@@ -156,6 +202,10 @@ static void test_parse_cpu_set(void) {
assert_se(str = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", str);
str = mfree(str);
+ assert_se(str = cpu_set_to_range_string(&c));
+ log_info("cpu_set_to_range_string: %s", str);
+ assert_se(streq(str, "8000-8191"));
+ str = mfree(str);
cpu_set_reset(&c);
}
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