Messages in this thread |  | | Subject | Re: [kselftests] compaction_test is blocked | From | Li Zhijian <> | Date | Mon, 12 Feb 2018 11:26:39 +0800 |
| |
On 2018年02月11日 13:44, Li Zhijian wrote: > > > On 02/10/2018 05:11 AM, Dan Rue wrote: >> On Fri, Feb 09, 2018 at 03:53:59PM +0800, Li Zhijian wrote: >>> Hi >>> >>> kselftests is integrated Intel 0Day project. >>> Sometimes we found compaction_test is blocked for more than 1 hours >>> until i kill it. >>> >>> Try to figure out where it is running, i added some log to this case. >>> >>> the test log is like: >>> ------------------- >>> [ 111.750543] main: 248 >>> [ 111.750544]- >>> [ 111.750821] check_compaction: 98 >>> [ 111.750822]- >>> [ 111.751102] check_compaction: 105 >>> [ 111.751103]- >>> [ 111.751362] check_compaction: 111 >>> [ 111.751363]- >>> [ 111.751621] check_compaction: 118 >>> [ 111.751622]- >>> [ 111.751879] check_compaction: 123 >>> [ 111.751880]- >>> ------------------- >>> 118 fprintf(stderr, "%s: %d\n", __func__, __LINE__); >>> 119 lseek(fd, 0, SEEK_SET); >>> 120 >>> 121 /* Request a large number of huge pages. The Kernel will >>> allocate >>> 122 as much as it can */ >>> 123 fprintf(stderr, "%s: %d\n", __func__, __LINE__); >>> <<<======== the last line we can catch. >>> 124 if (write(fd, "100000", (6*sizeof(char))) != >>> (6*sizeof(char))) { <<<<============ blocking position >>> 125 perror("Failed to write 100000 to >>> /proc/sys/vm/nr_hugepages\n"); >>> 126 goto close_fd; >>> 127 } >>> 128 >>> 129 lseek(fd, 0, SEEK_SET); >>> 130 >>> 131 fprintf(stderr, "%s: %d\n", __func__, __LINE__); >>> 132 if (read(fd, nr_hugepages, sizeof(nr_hugepages)) <= 0) { >>> 133 perror("Failed to re-read from >>> /proc/sys/vm/nr_hugepages\n"); >>> 134 goto close_fd; >>> 135 } >>> ------------------- >>> >>> According to above log and code, it most likely it is blocking at >>> the writing operation. >>> >>> my environment is like: >>> OS: debian >>> kernel: v4.15 >>> model: Ivytown Ivy Bridge-EP >>> nr_cpu: 48 >>> memory: 64G >> Hi Zhijian, >> >> Please try this patch in mainline: >> >> 4c1baad22390 kselftest: fix OOM in memory compaction test > > Hi Dan > > Thanks for your replies. > > I run this case on v4.15, looks this patch is already merged to v4.15. > lizhijian@inn:~/linux$ git describe 4c1baad > v4.15-rc2-2-g4c1baad223906
My mistake, this path is not contained by v4.15 yet. i will have a try.
Thanks
> > Thanks > >> Dan >> >>> >>> NOTE: 0Day can reproduce this issue in 20% on 0Day. >>> >>> Anybody can help have a look? >>> >>> Thanks >>> Zhjian >>> >>> >>> >>> -- >>> To unsubscribe from this list: send the line "unsubscribe >>> linux-kselftest" in >>> the body of a message to majordomo@vger.kernel.org >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >> >> . >> >
|  |