linux/drivers/base
Mel Gorman f19298b951 mm/vmstat: convert NUMA statistics to basic NUMA counters
NUMA statistics are maintained on the zone level for hits, misses, foreign
etc but nothing relies on them being perfectly accurate for functional
correctness.  The counters are used by userspace to get a general overview
of a workloads NUMA behaviour but the page allocator incurs a high cost to
maintain perfect accuracy similar to what is required for a vmstat like
NR_FREE_PAGES.  There even is a sysctl vm.numa_stat to allow userspace to
turn off the collection of NUMA statistics like NUMA_HIT.

This patch converts NUMA_HIT and friends to be NUMA events with similar
accuracy to VM events.  There is a possibility that slight errors will be
introduced but the overall trend as seen by userspace will be similar.
The counters are no longer updated from vmstat_refresh context as it is
unnecessary overhead for counters that may never be read by userspace.
Note that counters could be maintained at the node level to save space but
it would have a user-visible impact due to /proc/zoneinfo.

[lkp@intel.com: Fix misplaced closing brace for !CONFIG_NUMA]

Link: https://lkml.kernel.org/r/20210512095458.30632-4-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-06-29 10:53:54 -07:00
..
firmware_loader init/initramfs.c: do unpacking asynchronously 2021-05-07 00:26:33 -07:00
power PM: runtime: Fix unpaired parent child_count for force_resume 2021-05-10 19:14:01 +02:00
regmap regmap-irq: Fix dereference of a potentially null d->virt_buf 2021-04-07 16:58:33 +01:00
test kunit: software node: adhear to KUNIT formatting standard 2021-04-15 08:56:27 +02:00
arch_numa.c arch_numa: fix common code printing of phys_addr_t 2021-02-18 23:18:04 -08:00
arch_topology.c arch_topology: Export arch_freq_scale and helpers 2021-03-12 10:35:57 +05:30
attribute_container.c driver core: attribute_container: remove kernel-doc warnings 2021-04-02 16:40:07 +02:00
auxiliary.c driver core: auxiliary bus: Remove unneeded module bits 2021-03-23 10:47:55 +01:00
base.h driver core: Improve fw_devlink & deferred_probe_timeout interaction 2021-04-05 09:17:56 +02:00
bus.c drivers: base: change 'driver_create_groups' to 'driver_add_groups' in printk 2021-01-27 14:35:09 +01:00
cacheinfo.c drivers core: Use sysfs_emit for shared_cpu_map_show and shared_cpu_list_show 2020-10-02 13:24:40 +02:00
class.c drivers: base: fix some kernel-doc markups 2020-11-09 18:56:49 +01:00
component.c driver core: component: remove dentry pointer in "struct master" 2021-03-23 10:49:02 +01:00
container.c
core.c drivers: base: Reduce device link removal code duplication 2021-05-21 22:12:14 +02:00
cpu.c drivers/base/cpu: remove redundant assignment of variable retval 2021-03-23 14:56:50 +01:00
dd.c Linux 5.12-rc7 2021-04-14 19:53:39 +02:00
devcoredump.c devcoredump: fix kernel-doc warning 2021-04-02 16:40:08 +02:00
devres.c driver core: Replace printf() specifier and drop unneeded casting 2021-04-02 17:02:45 +02:00
devtmpfs.c devtmpfs: actually reclaim some init memory 2021-03-23 14:57:35 +01:00
driver.c drivers: base: Convert to printk alias functions 2020-07-10 14:16:44 +02:00
firmware.c
hypervisor.c
init.c driver core: auxiliary bus: Fix calling stage for auxiliary bus init 2021-02-11 08:43:03 +01:00
isa.c isa: Make the remove callback for isa drivers return void 2021-01-26 07:42:27 +01:00
Kconfig RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
Makefile numa: Move numa implementation to common code 2021-01-14 15:08:55 -08:00
map.c
memory.c drivers/base/memory: fix trying offlining memory blocks with memory holes on aarch64 2021-06-05 08:58:11 -07:00
module.c
node.c mm/vmstat: convert NUMA statistics to basic NUMA counters 2021-06-29 10:53:54 -07:00
pinctrl.c
platform-msi.c platform-msi: fix kernel-doc warnings 2021-04-02 16:40:08 +02:00
platform.c Revert "driver core: platform: Make platform_get_irq_optional() optional" 2021-04-07 11:47:56 +02:00
property.c media: device property: Call fwnode_graph_get_endpoint_by_id() for fwnode->secondary 2021-01-26 19:24:18 +01:00
soc.c soc: fix comment for freeing soc_dev_attr 2020-12-09 19:46:31 +01:00
swnode.c software node: Handle software node injection to an existing device properly 2021-06-23 19:34:58 +02:00
syscore.c syscore: Use pm_pr_dbg() for syscore_{suspend,resume}() 2020-09-08 13:32:06 +02:00
topology.c drivers core: Miscellaneous changes for sysfs_emit 2020-10-02 13:12:07 +02:00
transport_class.c scsi: drivers: base: Propagate errors through the transport component 2020-01-15 22:55:37 -05:00