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authorHuang Ying <ying.huang@intel.com>2023-09-26 09:06:28 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-10-17 01:44:39 +0300
commit6bc2cfdf82d56863b7cf5e86e37a662b2ae5d47e (patch)
tree7475bafbb2e698c79195568c7fc65b25183cd2ab /mm/memory-tiers.c
parent3718c02dbd4c88d47b5af003acdb3d1112604ea3 (diff)
downloadlinux-6bc2cfdf82d56863b7cf5e86e37a662b2ae5d47e.tar.xz
dax, kmem: calculate abstract distance with general interface
Previously, a fixed abstract distance MEMTIER_DEFAULT_DAX_ADISTANCE is used for slow memory type in kmem driver. This limits the usage of kmem driver, for example, it cannot be used for HBM (high bandwidth memory). So, we use the general abstract distance calculation mechanism in kmem drivers to get more accurate abstract distance on systems with proper support. The original MEMTIER_DEFAULT_DAX_ADISTANCE is used as fallback only. Now, multiple memory types may be managed by kmem. These memory types are put into the "kmem_memory_types" list and protected by kmem_memory_type_lock. Link: https://lkml.kernel.org/r/20230926060628.265989-5-ying.huang@intel.com Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Tested-by: Bharata B Rao <bharata@amd.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Alistair Popple <apopple@nvidia.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Wei Xu <weixugc@google.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Rafael J Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memory-tiers.c')
-rw-r--r--mm/memory-tiers.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
index 085321c77123..8d5291add2bc 100644
--- a/mm/memory-tiers.c
+++ b/mm/memory-tiers.c
@@ -586,13 +586,14 @@ EXPORT_SYMBOL_GPL(init_node_memory_type);
void clear_node_memory_type(int node, struct memory_dev_type *memtype)
{
mutex_lock(&memory_tier_lock);
- if (node_memory_types[node].memtype == memtype)
+ if (node_memory_types[node].memtype == memtype || !memtype)
node_memory_types[node].map_count--;
/*
* If we umapped all the attached devices to this node,
* clear the node memory type.
*/
if (!node_memory_types[node].map_count) {
+ memtype = node_memory_types[node].memtype;
node_memory_types[node].memtype = NULL;
put_memory_type(memtype);
}