From: Dan Williams <dan.j.williams@intel.com>
To: tglx@linutronix.de, mingo@redhat.com
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@redhat.com>,
Michal Hocko <mhocko@suse.com>, kbuild test robot <lkp@intel.com>,
vishal.l.verma@intel.com, hch@lst.de,
linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org,
x86@kernel.org
Subject: [PATCH v3 5/6] x86/numa: Provide a range-to-target_node lookup facility
Date: Mon, 20 Jan 2020 11:03:17 -0800 [thread overview]
Message-ID: <157954699737.2239526.1354165361263706814.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
In-Reply-To: <157954696789.2239526.17707265517154476652.stgit@dwillia2-desk3.amr.corp.intel.com>
The DEV_DAX_KMEM facility is a generic mechanism to allow device-dax
instances, fronting performance-differentiated-memory like pmem, to be
added to the System RAM pool. The numa node for that hot-added memory is
derived from the device-dax instance's 'target_node' attribute.
Recall that the 'target_node' is the ACPI-PXM-to-node translation for
memory when it comes online whereas the 'numa_node' attribute of the
device represents the closest online cpu node.
Presently useful target_node information from the ACPI SRAT is discarded
with the expectation that "Reserved" memory will never be onlined. Now,
DEV_DAX_KMEM violates that assumption, there is a need to retain the
translation. Move, rather than discard, numa_memblk data to a secondary
array that memory_add_physaddr_to_target_node() may consider at a later
point in time.
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <x86@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
arch/x86/mm/numa.c | 68 +++++++++++++++++++++++++++++++++++++++++++-------
include/linux/numa.h | 8 +++++-
mm/mempolicy.c | 5 ++++
3 files changed, 70 insertions(+), 11 deletions(-)
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 5289d9d6799a..f2c8fca36f28 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -26,6 +26,7 @@ struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL(node_data);
static struct numa_meminfo numa_meminfo __initdata_numa;
+static struct numa_meminfo numa_reserved_meminfo __initdata_numa;
static int numa_distance_cnt;
static u8 *numa_distance;
@@ -164,6 +165,26 @@ void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi)
(mi->nr_blks - idx) * sizeof(mi->blk[0]));
}
+/**
+ * numa_move_memblk - Move one numa_memblk from one numa_meminfo to another
+ * @dst: numa_meminfo to move block to
+ * @idx: Index of memblk to remove
+ * @src: numa_meminfo to remove memblk from
+ *
+ * If @dst is non-NULL add it at the @dst->nr_blks index and increment
+ * @dst->nr_blks, then remove it from @src.
+ */
+static void __init numa_move_memblk(struct numa_meminfo *dst, int idx,
+ struct numa_meminfo *src)
+{
+ if (dst) {
+ memcpy(&dst->blk[dst->nr_blks], &src->blk[idx],
+ sizeof(struct numa_memblk));
+ dst->nr_blks++;
+ }
+ numa_remove_memblk_from(idx, src);
+}
+
/**
* numa_add_memblk - Add one numa_memblk to numa_meminfo
* @nid: NUMA node ID of the new memblk
@@ -233,14 +254,19 @@ int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
for (i = 0; i < mi->nr_blks; i++) {
struct numa_memblk *bi = &mi->blk[i];
- /* make sure all blocks are inside the limits */
+ /* move / save reserved memory ranges */
+ if (!memblock_overlaps_region(&memblock.memory,
+ bi->start, bi->end - bi->start)) {
+ numa_move_memblk(&numa_reserved_meminfo, i--, mi);
+ continue;
+ }
+
+ /* make sure all non-reserved blocks are inside the limits */
bi->start = max(bi->start, low);
bi->end = min(bi->end, high);
- /* and there's no empty or non-exist block */
- if (bi->start >= bi->end ||
- !memblock_overlaps_region(&memblock.memory,
- bi->start, bi->end - bi->start))
+ /* and there's no empty block */
+ if (bi->start >= bi->end)
numa_remove_memblk_from(i--, mi);
}
@@ -877,16 +903,38 @@ EXPORT_SYMBOL(cpumask_of_node);
#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
-#ifdef CONFIG_MEMORY_HOTPLUG
-int memory_add_physaddr_to_nid(u64 start)
+#ifdef CONFIG_KEEP_NUMA
+static int meminfo_to_nid(struct numa_meminfo *mi, u64 start)
{
- struct numa_meminfo *mi = &numa_meminfo;
- int nid = mi->blk[0].nid;
int i;
for (i = 0; i < mi->nr_blks; i++)
if (mi->blk[i].start <= start && mi->blk[i].end > start)
- nid = mi->blk[i].nid;
+ return mi->blk[i].nid;
+ return NUMA_NO_NODE;
+}
+
+int phys_to_target_node(phys_addr_t start)
+{
+ int nid = meminfo_to_nid(&numa_meminfo, start);
+
+ /*
+ * Prefer online nodes, but if reserved memory might be
+ * hot-added continue the search with reserved ranges.
+ */
+ if (nid != NUMA_NO_NODE)
+ return nid;
+
+ return meminfo_to_nid(&numa_reserved_meminfo, start);
+}
+EXPORT_SYMBOL_GPL(phys_to_target_node);
+
+int memory_add_physaddr_to_nid(u64 start)
+{
+ int nid = meminfo_to_nid(&numa_meminfo, start);
+
+ if (nid == NUMA_NO_NODE)
+ nid = numa_meminfo.blk[0].nid;
return nid;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
diff --git a/include/linux/numa.h b/include/linux/numa.h
index c005ed6b807b..cad0ab165619 100644
--- a/include/linux/numa.h
+++ b/include/linux/numa.h
@@ -1,7 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_NUMA_H
#define _LINUX_NUMA_H
-
+#include <linux/types.h>
#ifdef CONFIG_NODES_SHIFT
#define NODES_SHIFT CONFIG_NODES_SHIFT
@@ -21,11 +21,17 @@
#ifdef CONFIG_NUMA
int numa_map_to_online_node(int node);
+int phys_to_target_node(phys_addr_t addr);
#else
static inline int numa_map_to_online_node(int node)
{
return NUMA_NO_NODE;
}
+
+static inline int phys_to_target_node(phys_addr_t addr)
+{
+ return NUMA_NO_NODE;
+}
#endif
#endif /* _LINUX_NUMA_H */
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 30d76db718bf..c564b77decf5 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -3015,3 +3015,8 @@ void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
p += scnprintf(p, buffer + maxlen - p, ":%*pbl",
nodemask_pr_args(&nodes));
}
+
+__weak int phys_to_target_node(phys_addr_t addr)
+{
+ return NUMA_NO_NODE;
+}
next prev parent reply other threads:[~2020-01-20 19:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-20 19:02 [PATCH v3 0/6] Memory Hierarchy: Enable target node lookups for reserved memory Dan Williams
2020-01-20 19:02 ` [PATCH v3 1/6] ACPI: NUMA: Up-level "map to online node" functionality Dan Williams
2020-01-20 19:02 ` [PATCH v3 2/6] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node() Dan Williams
2020-01-21 1:36 ` Aneesh Kumar K.V
2020-01-21 3:09 ` Dan Williams
2020-01-20 19:03 ` [PATCH v3 3/6] powerpc/papr_scm: Switch to numa_map_to_online_node() Dan Williams
2020-01-20 19:03 ` [PATCH v3 4/6] x86/mm: Introduce CONFIG_KEEP_NUMA Dan Williams
2020-01-20 19:03 ` Dan Williams [this message]
2020-01-20 19:03 ` [PATCH v3 6/6] libnvdimm/e820: Retrieve and populate correct 'target_node' info Dan Williams
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