From http://lxr.linux.no/#linux+v2.6.37/Documentation/cgroups/cpusets.txt
"Note that for legacy reasons, the "cpuset" filesystem exists as a wrapper around the cgroup filesystem. The command mount -t cpuset X /dev/cpuset is equivalent to mount -t cgroup -ocpuset,noprefix X /dev/cpuset" However, I found this is not always case. In addition, there is an direct implementation without cgroup, and I can't find any doc about the behaviours of the prefix. So, It can be difficult to predict if cpuset files have prefix or not, so only to fail after checked both. Signed-off-by: CAI Qian <[email protected]> Signed-off-by: Han Pingtian <[email protected]> --- testcases/kernel/mem/lib/mem.c | 24 ++++++++++++++++++++---- 1 files changed, 20 insertions(+), 4 deletions(-) diff --git a/testcases/kernel/mem/lib/mem.c b/testcases/kernel/mem/lib/mem.c index 1a53359..7bc26cd 100644 --- a/testcases/kernel/mem/lib/mem.c +++ b/testcases/kernel/mem/lib/mem.c @@ -89,16 +89,32 @@ void write_cpusets(void) gather_cpus(cpus); tst_resm(TINFO, "CPU list for 2nd node is %s.", cpus); + /* try either '/dev/cpuset/mems' or '/dev/cpuset/cpuset.mems' + * please see Documentation/cgroups/cpusets.txt of kernel src for detail */ fd = open(CPATH_NEW "/mems", O_WRONLY); - if (fd == -1) - tst_brkm(TBROK|TERRNO, cleanup, "open %s", buf); + if (fd == -1) { + if (errno == ENOENT) { + fd = open(CPATH_NEW "/cpuset.mems", O_WRONLY); + if (fd == -1) + tst_brkm(TBROK|TERRNO, cleanup, "open %s", buf); + } else + tst_brkm(TBROK|TERRNO, cleanup, "open %s", buf); + } if (write(fd, "1", 1) != 1) tst_brkm(TBROK|TERRNO, cleanup, "write %s", buf); close(fd); + /* try either '/dev/cpuset/cpus' or '/dev/cpuset/cpuset.cpus' + * please see Documentation/cgroups/cpusets.txt of kernel src for detail */ fd = open(CPATH_NEW "/cpus", O_WRONLY); - if (fd == -1) - tst_brkm(TBROK|TERRNO, cleanup, "open %s", buf); + if (fd == -1) { + if (errno == ENOENT) { + fd = open(CPATH_NEW "/cpuset.cpus", O_WRONLY); + if (fd == -1) + tst_brkm(TBROK|TERRNO, cleanup, "open %s", buf); + } else + tst_brkm(TBROK|TERRNO, cleanup, "open %s", buf); + } if (write(fd, cpus, strlen(cpus)) != strlen(cpus)) tst_brkm(TBROK|TERRNO, cleanup, "write %s", buf); close(fd); -- 1.7.1 ------------------------------------------------------------------------------ The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: Pinpoint memory and threading errors before they happen. Find and fix more than 250 security defects in the development cycle. Locate bottlenecks in serial and parallel code that limit performance. http://p.sf.net/sfu/intel-dev2devfeb _______________________________________________ Ltp-list mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ltp-list
