Running the compaction_test sometimes results in out-of-memory failures. When I debugged this, it turned out that the code to reset the number of hugepages to the initial value is simply broken since we write into an open sysctl file descriptor multiple times without seeking back to the start.
Adding the lseek here fixes the problem.
Cc: stable@vger.kernel.org Reported-by: Naresh Kamboju naresh.kamboju@linaro.org Link: https://bugs.linaro.org/show_bug.cgi?id=3145 Signed-off-by: Arnd Bergmann arnd@arndb.de --- tools/testing/selftests/vm/compaction_test.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/tools/testing/selftests/vm/compaction_test.c b/tools/testing/selftests/vm/compaction_test.c index a65b016d4c13..1097f04e4d80 100644 --- a/tools/testing/selftests/vm/compaction_test.c +++ b/tools/testing/selftests/vm/compaction_test.c @@ -137,6 +137,8 @@ int check_compaction(unsigned long mem_free, unsigned int hugepage_size) printf("No of huge pages allocated = %d\n", (atoi(nr_hugepages)));
+ lseek(fd, 0, SEEK_SET); + if (write(fd, initial_nr_hugepages, strlen(initial_nr_hugepages)) != strlen(initial_nr_hugepages)) { perror("Failed to write value to /proc/sys/vm/nr_hugepages\n");
On 01/09/2018 09:26 AM, Arnd Bergmann wrote:
Running the compaction_test sometimes results in out-of-memory failures. When I debugged this, it turned out that the code to reset the number of hugepages to the initial value is simply broken since we write into an open sysctl file descriptor multiple times without seeking back to the start.
Adding the lseek here fixes the problem.
Cc: stable@vger.kernel.org Reported-by: Naresh Kamboju naresh.kamboju@linaro.org Link: https://bugs.linaro.org/show_bug.cgi?id=3145 Signed-off-by: Arnd Bergmann arnd@arndb.de
tools/testing/selftests/vm/compaction_test.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/tools/testing/selftests/vm/compaction_test.c b/tools/testing/selftests/vm/compaction_test.c index a65b016d4c13..1097f04e4d80 100644 --- a/tools/testing/selftests/vm/compaction_test.c +++ b/tools/testing/selftests/vm/compaction_test.c @@ -137,6 +137,8 @@ int check_compaction(unsigned long mem_free, unsigned int hugepage_size) printf("No of huge pages allocated = %d\n", (atoi(nr_hugepages)));
- lseek(fd, 0, SEEK_SET);
- if (write(fd, initial_nr_hugepages, strlen(initial_nr_hugepages)) != strlen(initial_nr_hugepages)) { perror("Failed to write value to /proc/sys/vm/nr_hugepages\n");
Thanks for the patch. I will get this into 4.16-rc1
thanks, -- Shuah -- 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
On 01/09/2018 09:47 AM, Shuah Khan wrote:
On 01/09/2018 09:26 AM, Arnd Bergmann wrote:
Running the compaction_test sometimes results in out-of-memory failures. When I debugged this, it turned out that the code to reset the number of hugepages to the initial value is simply broken since we write into an open sysctl file descriptor multiple times without seeking back to the start.
Adding the lseek here fixes the problem.
Cc: stable@vger.kernel.org Reported-by: Naresh Kamboju naresh.kamboju@linaro.org Link: https://bugs.linaro.org/show_bug.cgi?id=3145 Signed-off-by: Arnd Bergmann arnd@arndb.de
tools/testing/selftests/vm/compaction_test.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/tools/testing/selftests/vm/compaction_test.c b/tools/testing/selftests/vm/compaction_test.c index a65b016d4c13..1097f04e4d80 100644 --- a/tools/testing/selftests/vm/compaction_test.c +++ b/tools/testing/selftests/vm/compaction_test.c @@ -137,6 +137,8 @@ int check_compaction(unsigned long mem_free, unsigned int hugepage_size) printf("No of huge pages allocated = %d\n", (atoi(nr_hugepages)));
- lseek(fd, 0, SEEK_SET);
- if (write(fd, initial_nr_hugepages, strlen(initial_nr_hugepages)) != strlen(initial_nr_hugepages)) { perror("Failed to write value to /proc/sys/vm/nr_hugepages\n");
Thanks for the patch. I will get this into 4.16-rc1
Applied to linux-kselftest next for 4.16-rc1
thanks, -- Shuah
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