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With the addition of the ABD changes consumption of the virtual address space has been greatly reduced. This exposed an issue on CONFIG_HIGHMEM systems where free memory was being calculated incorrectly. Functionally this didn't cause any major problems prior to ABD because a lack of available virtual address space was used as an indicator of low memory. This patch makes the following changes to address the issue and in the process realigns the code further with OpenZFS. There are no substantive changes in behavior for 64-bit systems. * Added CONFIG_HIGHMEM case to the arc_all_memory() and arc_free_memory() functions to only consider low memory pages on CONFIG_HIGHMEM systems. * The arc_free_memory() function was updated to return bytes instead of pages to be consistent with the other helper functions. In user space we make up some reasonable values since currently only testing is performed in this context. * Adds three new values to the arcstats kstat to provide visibility in to the ARC's assessment of the memory situation: memory_all_bytes, memory_free_bytes, and memory_available_bytes. * Added kmem_reap() call to arc_available_memory() for 32-bit builds to realign code with OpenZFS. * Reduced size of test file in /async_destroy_001_pos.ksh to speed up test case. Multiple txgs are still required. * Move vdevs used by zpool_clear_001_pos and zpool_upgrade_002_pos to TEST_BASE_DIR location to speed up test cases. Reviewed-by: David Quigley <david.quigley@intel.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #5352 Closes #6734 |
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ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.
Official Resources
Installation
Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.
Contribute & Develop
We have a separate document with contribution guidelines.