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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: 2017-08-242209e409Linux 4.8+ compatibility fix for vm stats 2017-09-16787acae0Linux 3.14 compat: IO acct, global_page_state, etc 2017-09-19661907e6Linux 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 #7170
79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
#ifndef _ZFS_PAGE_COMPAT_H
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#define _ZFS_PAGE_COMPAT_H
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/*
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* We have various enum members moving between two separate enum types,
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* and accessed by different functions at various times. Centralise the
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* insanity.
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*
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* < v4.8: all enums in zone_stat_item, via global_page_state()
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* v4.8: some enums moved to node_stat_item, global_node_page_state() introduced
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* v4.13: some enums moved from zone_stat_item to node_state_item
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* v4.14: global_page_state() rename to global_zone_page_state()
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*
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* The defines used here are created by config/kernel-global_page_state.m4
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*/
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/*
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* Create our own accessor functions to follow the Linux API changes
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*/
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#if defined(ZFS_GLOBAL_ZONE_PAGE_STATE)
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/* global_zone_page_state() introduced */
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#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_FILE_PAGES)
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#define nr_file_pages() global_node_page_state(NR_FILE_PAGES)
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#else
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#define nr_file_pages() global_zone_page_state(NR_FILE_PAGES)
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#endif
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#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_INACTIVE_ANON)
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#define nr_inactive_anon_pages() global_node_page_state(NR_INACTIVE_ANON)
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#else
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#define nr_inactive_anon_pages() global_zone_page_state(NR_INACTIVE_ANON)
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#endif
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#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_INACTIVE_FILE)
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#define nr_inactive_file_pages() global_node_page_state(NR_INACTIVE_FILE)
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#else
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#define nr_inactive_file_pages() global_zone_page_state(NR_INACTIVE_FILE)
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#endif
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#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE)
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#define nr_slab_reclaimable_pages() global_node_page_state(NR_SLAB_RECLAIMABLE)
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#else
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#define nr_slab_reclaimable_pages() global_zone_page_state(NR_SLAB_RECLAIMABLE)
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#endif
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#elif defined(ZFS_GLOBAL_NODE_PAGE_STATE)
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/* global_node_page_state() introduced */
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#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_FILE_PAGES)
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#define nr_file_pages() global_node_page_state(NR_FILE_PAGES)
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#else
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#define nr_file_pages() global_page_state(NR_FILE_PAGES)
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#endif
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#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_INACTIVE_ANON)
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#define nr_inactive_anon_pages() global_node_page_state(NR_INACTIVE_ANON)
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#else
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#define nr_inactive_anon_pages() global_page_state(NR_INACTIVE_ANON)
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#endif
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#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_INACTIVE_FILE)
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#define nr_inactive_file_pages() global_node_page_state(NR_INACTIVE_FILE)
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#else
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#define nr_inactive_file_pages() global_page_state(NR_INACTIVE_FILE)
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#endif
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#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE)
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#define nr_slab_reclaimable_pages() global_node_page_state(NR_SLAB_RECLAIMABLE)
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#else
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#define nr_slab_reclaimable_pages() global_page_state(NR_SLAB_RECLAIMABLE)
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#endif
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#else
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/* global_page_state() only */
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#define nr_file_pages() global_page_state(NR_FILE_PAGES)
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#define nr_inactive_anon_pages() global_page_state(NR_INACTIVE_ANON)
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#define nr_inactive_file_pages() global_page_state(NR_INACTIVE_FILE)
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#define nr_slab_reclaimable_pages() global_page_state(NR_SLAB_RECLAIMABLE)
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#endif /* ZFS_GLOBAL_ZONE_PAGE_STATE */
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#endif /* _ZFS_PAGE_COMPAT_H */
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