Fix free memory calculation on v3.14+ #7238
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Provide infrastructure to auto-configure to enum and API changes in the global page stats used for our free memory calculations. arc_free_memory has been broken since an API change in Linux v3.14: 2016-07-28 v4.8 599d0c95 mm, vmscan: move LRU lists to node 2016-07-28 v4.8 75ef7184 mm, vmstat: add infrastructure for per-node vmstats These commits moved some of global_page_state() into global_node_page_state(). The API change was particularly egregious as, instead of breaking the old code, it silently did the wrong thing and we continued using global_page_state() where we should have been using global_node_page_state(), thus indexing into the wrong array via NR_SLAB_RECLAIMABLE et al. There have been further API changes along the way: 2017-07-06 v4.13 385386cf mm: vmstat: move slab statistics from zone to node counters 2017-09-06 v4.14 c41f012a mm: rename global_page_state to global_zone_page_state ...and various (incomplete, as it turns out) attempts to accomodate these changes in ZoL: 2017-08-24 2209e40 Linux 4.8+ compatibility fix for vm stats 2017-09-16 787acae Linux 3.14 compat: IO acct, global_page_state, etc 2017-09-19 661907e Linux 4.14 compat: IO acct, global_page_state, etc The config infrastructure provided here resolves these issues going back to the original API change in v3.14 and is robust against further Linux changes in this area. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Chris Dunlop <chris@onthe.net.au> Closes openzfs#7170
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@aerusso thanks, I'll include this in my 0.7.7 patch stack. |
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This patch (e9a7729) from master is marked as to-do for the stable branch. This PR re-bases it, taking into account the slight changes in
scripts/Makefile.amrelative to master.Description
e9a7729 applies cleanly, except for formatting issues in
scripts/Makefile.am.Motivation and Context
Marked as to-do, long-standing compatibility bug.
How Has This Been Tested?
I've built this, and installed it on a machine. The build infrastructure provides additional testing.
Types of changes
Checklist:
Signed-off-by.