Support setcpuaffinity on linux/bsd

Currently, there are several types of threads/child processes of a
redis server. Sometimes we need deeply optimise the performance of
redis, so we would like to isolate threads/processes.

There were some discussion about cpu affinity cases in the issue:
https://github.com/antirez/redis/issues/2863

So implement cpu affinity setting by redis.conf in this patch, then
we can config server_cpulist/bio_cpulist/aof_rewrite_cpulist/
bgsave_cpulist by cpu list.

Examples of cpulist in redis.conf:
server_cpulist 0-7:2      means cpu affinity 0,2,4,6
bio_cpulist 1,3           means cpu affinity 1,3
aof_rewrite_cpulist 8-11  means cpu affinity 8,9,10,11
bgsave_cpulist 1,10-11    means cpu affinity 1,10,11

Test on linux/freebsd, both work fine.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>

1 files changed, 129 insertions, 0 deletions

diff --git a/src/setcpuaffinity.c b/src/setcpuaffinity.c
new file mode 100644
index 000000000..1a12795cd
--- /dev/null
+++ b/src/setcpuaffinity.c
@@ -0,0 +1,129 @@
+/* ==========================================================================
+ * setproctitle.c - Linux/BSD setcpuaffinity.
+ * --------------------------------------------------------------------------
+ * Copyright (C) 2020  zhenwei pi
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to permit
+ * persons to whom the Software is furnished to do so, subject to the
+ * following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+ * NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * ==========================================================================
+ */
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#ifdef __linux__
+#include <sched.h>
+#endif
+#ifdef __FreeBSD__
+#include <sys/param.h>
+#include <sys/cpuset.h>
+#endif
+#include "config.h"
+
+#ifdef USE_SETCPUAFFINITY
+static const char *next_token(const char *q,  int sep) {
+    if (q)
+        q = strchr(q, sep);
+    if (q)
+        q++;
+
+    return q;
+}
+
+static int next_num(const char *str, char **end, int *result) {
+    if (!str || *str == '\0' || !isdigit(*str))
+        return -1;
+
+    *result = strtoul(str, end, 10);
+    if (str == *end)
+        return -1;
+
+    return 0;
+}
+
+/* set current thread cpu affinity to cpu list, this function works like
+ * taskset command (actually cpulist parsing logic reference to util-linux).
+ * example of this function: "0,2,3", "0,2-3", "0-20:2". */
+void setcpuaffinity(const char *cpulist) {
+    const char *p, *q;
+    char *end = NULL;
+#ifdef __linux__
+    cpu_set_t cpuset;
+#endif
+#ifdef __FreeBSD__
+    cpuset_t cpuset;
+#endif
+
+    if (!cpulist)
+        return;
+
+    CPU_ZERO(&cpuset);
+
+    q = cpulist;
+    while (p = q, q = next_token(q, ','), p) {
+        int a, b, s;
+        const char *c1, *c2;
+
+        if (next_num(p, &end, &a) != 0)
+            return;
+
+        b = a;
+        s = 1;
+        p = end;
+
+        c1 = next_token(p, '-');
+        c2 = next_token(p, ',');
+
+        if (c1 != NULL && (c2 == NULL || c1 < c2)) {
+            if (next_num(c1, &end, &b) != 0)
+                return;
+
+            c1 = end && *end ? next_token(end, ':') : NULL;
+            if (c1 != NULL && (c2 == NULL || c1 < c2)) {
+                if (next_num(c1, &end, &s) != 0)
+                    return;
+
+                if (s == 0)
+                    return;
+            }
+        }
+
+        if ((a > b))
+            return;
+
+        while (a <= b) {
+            CPU_SET(a, &cpuset);
+            a += s;
+        }
+    }
+
+    if (end && *end)
+        return;
+
+#ifdef __linux__
+    sched_setaffinity(0, sizeof(cpuset), &cpuset);
+#endif
+#ifdef __FreeBSD__
+    cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, -1, sizeof(cpuset), &cpuset);
+#endif
+}
+
+#endif /* USE_SETCPUAFFINITY */