Re: [PATCH 6.1.y] selftests/mm: compaction_test: support platform with huge mount of memory

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: ab00ddd802f80e31fc9639c652d736fe3913feae

Status in newer kernel trees:
6.14.y | Present (different SHA1: cc09dec6cce3)
6.12.y | Present (different SHA1: 72669f82feb1)
6.6.y | Not found

Note: The patch differs from the upstream commit:
---
1:  ab00ddd802f80 ! 1:  a22426c38dd6a selftests/mm: compaction_test: support platform with huge mount of memory
    @@ Metadata
      ## Commit message ##
         selftests/mm: compaction_test: support platform with huge mount of memory
     
    +    commit ab00ddd802f80e31fc9639c652d736fe3913feae upstream.
    +
         When running mm selftest to verify mm patches, 'compaction_test' case
         failed on an x86 server with 1TB memory.  And the root cause is that it
         has too much free memory than what the test supports.
    @@ Commit message
         Signed-off-by: Feng Tang <feng.tang@linux.alibaba.com>
         Acked-by: Dev Jain <dev.jain@arm.com>
         Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
    -    Tested-by: Baolin Wang <baolin.wang@inux.alibaba.com>
    +    Tested-by: Baolin Wang <baolin.wang@linux.alibaba.com>
         Cc: Shuah Khan <shuah@kernel.org>
         Cc: Sri Jayaramappa <sjayaram@akamai.com>
         Cc: <stable@vger.kernel.org>
         Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
     
    - ## tools/testing/selftests/mm/compaction_test.c ##
    -@@ tools/testing/selftests/mm/compaction_test.c: int check_compaction(unsigned long mem_free, unsigned long hugepage_size,
    + ## tools/testing/selftests/vm/compaction_test.c ##
    +@@ tools/testing/selftests/vm/compaction_test.c: int check_compaction(unsigned long mem_free, unsigned long hugepage_size)
      	int compaction_index = 0;
    + 	char initial_nr_hugepages[20] = {0};
      	char nr_hugepages[20] = {0};
    - 	char init_nr_hugepages[24] = {0};
     +	char target_nr_hugepages[24] = {0};
     +	int slen;
      
    - 	snprintf(init_nr_hugepages, sizeof(init_nr_hugepages),
    - 		 "%lu", initial_nr_hugepages);
    -@@ tools/testing/selftests/mm/compaction_test.c: int check_compaction(unsigned long mem_free, unsigned long hugepage_size,
    - 		goto out;
    - 	}
    + 	/* We want to test with 80% of available memory. Else, OOM killer comes
    + 	   in to play */
    +@@ tools/testing/selftests/vm/compaction_test.c: int check_compaction(unsigned long mem_free, unsigned long hugepage_size)
    + 
    + 	lseek(fd, 0, SEEK_SET);
      
     -	/* Request a large number of huge pages. The Kernel will allocate
     -	   as much as it can */
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.1.y        |  Success    |  Success   |