| Message ID | 20240515093633.54814-2-dev.jain@arm.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Fixes for compaction_test | expand |
On Wed, 15 May 2024 15:06:32 +0530 Dev Jain <dev.jain@arm.com> wrote: > nr_hugepages is not set to zero because the file offset has not been reset > after read(). Fix that using lseek(). > Please fully describe the runtime effects of this bug.
On 5/20/24 05:30, Andrew Morton wrote: > On Wed, 15 May 2024 15:06:32 +0530 Dev Jain <dev.jain@arm.com> wrote: > >> nr_hugepages is not set to zero because the file offset has not been reset >> after read(). Fix that using lseek(). >> > Please fully describe the runtime effects of this bug. This is not a "bug", but a discrepancy; the following comment by the author says "Start with the initial condition of 0 huge pages", I am just ensuring that that is actually done. Although, I am not sure about the utility of doing this in the first place, since we are anyways trying to increase hugepages after that. In the second patch, I have moved away this entire logic of setting nr_hugepages to zero, to the place before we start filling up memory; if you feel that this patch is unnecessary, we may squash it.
diff --git a/tools/testing/selftests/mm/compaction_test.c b/tools/testing/selftests/mm/compaction_test.c index 533999b6c284..c5be395f8363 100644 --- a/tools/testing/selftests/mm/compaction_test.c +++ b/tools/testing/selftests/mm/compaction_test.c @@ -107,6 +107,8 @@ int check_compaction(unsigned long mem_free, unsigned int hugepage_size) goto close_fd; } + lseek(fd, 0, SEEK_SET); + /* Start with the initial condition of 0 huge pages*/ if (write(fd, "0", sizeof(char)) != sizeof(char)) { ksft_print_msg("Failed to write 0 to /proc/sys/vm/nr_hugepages: %s\n",
nr_hugepages is not set to zero because the file offset has not been reset after read(). Fix that using lseek(). Fixes: bd67d5c15cc1 ("Test compaction of mlocked memory") Cc: stable@vger.kernel.org Signed-off-by: Dev Jain <dev.jain@arm.com> --- Merge dependency: https://lore.kernel.org/all/20240513082842.4117782-1-dev.jain@arm.com/ Andrew, does it sound reasonable to have the fixes tag in the above patch too, along with this series? tools/testing/selftests/mm/compaction_test.c | 2 ++ 1 file changed, 2 insertions(+)