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By setting __GFP_NORETRY the kernel memory reclaim logic was allowed to abort early and dump a falled allocation stack to the console. Since this was done in a tight loop to fill memory it could result in a large number of stacks being dumped to the console. This in turn slowed down the test sufficiently so it exceeded the time limit and failed. To resolve this issue the __GFP_NORETRY flag is being removed. This is how it should have been called originally to ensure we're simulating the behavior of most callers which will use the GFP_KERNEL flag. In addition, the reclaim granularity of 1000 objects was far to coarse for this to be a realistic test. For kmem:slab_reclaim there might only be a few thousand objects total in the cache. Therefore, the SPLAT_KMEM_OBJ_RECLAIM constant for these tests was lowered. This will cause the reclaim callback to run more frequently which makes for a better test case. The frequency of the cache reaping in kmem:slab_reap was increased to accommodate the reduced number of objects released during the reclaim. These changes only impact the test cases and were done to remove false positives caused by the test case itself. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> |
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