a0a0b3f42e
Pages containing buffer_heads that are in one of the per-CPU buffer_head LRU caches will be pinned and thus cannot be migrated. This can prevent CMA allocations from succeeding, which are often used on platforms with co-processors (such as a DSP) that can only use physically contiguous memory. It can also prevent memory hot-unplugging from succeeding, which involves migrating at least MIN_MEMORY_BLOCK_SIZE bytes of memory, which ranges from 8 MiB to 1 GiB based on the architecture in use. Correspondingly, invalidate the BH LRU caches before a migration starts and stop any buffer_head from being cached in the LRU caches, until migration has finished. Bug: 180018981 Link: https://lore.kernel.org/linux-mm/20210319175127.886124-3-minchan@kernel.org/ Tested-by: Oliver Sang <oliver.sang@intel.com> Reported-by: kernel test robot <oliver.sang@intel.com> Signed-off-by: Chris Goldsworthy <cgoldswo@codeaurora.org> Signed-off-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Minchan Kim <minchan@google.com> Change-Id: Idb8279cb561812f5f1b43ddbb742c1808700754e |
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