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NUMA: hide non-existing nodes from /sys/devices/system/node listing

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This commit is contained in:
Balazs Gerofi
2016-11-05 16:12:08 +09:00
parent 259583e936
commit 69a5c53074
5 changed files with 75 additions and 0 deletions
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58
executer/user/mcexec.c
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@@ -41,6 +41,7 @@
#include <sys/mman.h>
#include <asm/unistd.h>
#include <sched.h>
#include <dirent.h>
#include <termios.h>
#include <sys/ioctl.h>
@@ -1732,6 +1733,63 @@ do_generic_syscall(
ret = 0;
}
/* Fake that nodeX in /sys/devices/system/node do not exist,
* where X >= number of LWK NUMA nodes */
else if (w->sr.number == __NR_getdents && ret > 0) {
struct linux_dirent {
long d_ino;
off_t d_off;
unsigned short d_reclen;
char d_name[];
};
struct linux_dirent *d;
char *buf = (char *)w->sr.args[1];
int bpos = 0;
int nodes,len;
char proc_path[PATH_MAX];
char path[PATH_MAX];
sprintf(proc_path, "/proc/self/fd/%d", (int)w->sr.args[0]);
/* Get filename */
if ((len = readlink(proc_path, path, sizeof(path))) < 0) {
fprintf(stderr, "%s: error: readlink() failed for %s\n",
__FUNCTION__, proc_path);
goto out;
}
path[len] = 0;
/* Not /sys/devices/system/node ? */
if (strcmp(path, "/sys/devices/system/node"))
goto out;
nodes = ioctl(fd, MCEXEC_UP_GET_NODES, 0);
if (nodes == -1) {
goto out;
}
d = (struct linux_dirent *) (buf + bpos);
for (bpos = 0; bpos < ret; ) {
int nodeid, tmp_reclen;
d = (struct linux_dirent *) (buf + bpos);
if (sscanf(d->d_name, "node%d", &nodeid) != 1) {
bpos += d->d_reclen;
continue;
}
if (nodeid >= nodes) {
tmp_reclen = d->d_reclen;
memmove(buf + bpos,
buf + bpos + tmp_reclen,
ret - bpos - tmp_reclen);
ret -= tmp_reclen;
continue;
}
bpos += d->d_reclen;
}
}
out:
__dprintf("do_generic_syscall(%ld):%ld (%#lx)\n", w->sr.number, ret, ret);