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| author | David Hildenbrand <david@redhat.com> | 2022-10-14 15:47:19 +0200 |
|---|---|---|
| committer | David Hildenbrand <david@redhat.com> | 2022-10-27 11:01:03 +0200 |
| commit | e6816458624813de4a31f89096a620b410e1c2b8 (patch) | |
| tree | 327eb49230110c949e5443ebae4d1fd64336acf8 /include | |
| parent | e04a34e55cf1911099e2d8a680f9bee4f6d90e4a (diff) | |
| download | qemu-e6816458624813de4a31f89096a620b410e1c2b8.zip qemu-e6816458624813de4a31f89096a620b410e1c2b8.tar.gz qemu-e6816458624813de4a31f89096a620b410e1c2b8.tar.bz2 | |
hostmem: Allow for specifying a ThreadContext for preallocation
Let's allow for specifying a thread context via the "prealloc-context"
property. When set, preallcoation threads will be crated via the
thread context -- inheriting the same CPU affinity as the thread
context.
Pinning preallcoation threads to CPUs can heavily increase performance
in NUMA setups, because, preallocation from a CPU close to the target
NUMA node(s) is faster then preallocation from a CPU further remote,
simply because of memory bandwidth for initializing memory with zeroes.
This is especially relevant for very large VMs backed by huge/gigantic
pages, whereby preallocation is mandatory.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Message-Id: <20221014134720.168738-7-david@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/sysemu/hostmem.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/sysemu/hostmem.h b/include/sysemu/hostmem.h index 9ff5c16..39326f1 100644 --- a/include/sysemu/hostmem.h +++ b/include/sysemu/hostmem.h @@ -18,6 +18,7 @@ #include "qom/object.h" #include "exec/memory.h" #include "qemu/bitmap.h" +#include "qemu/thread-context.h" #define TYPE_MEMORY_BACKEND "memory-backend" OBJECT_DECLARE_TYPE(HostMemoryBackend, HostMemoryBackendClass, @@ -66,6 +67,7 @@ struct HostMemoryBackend { bool merge, dump, use_canonical_path; bool prealloc, is_mapped, share, reserve; uint32_t prealloc_threads; + ThreadContext *prealloc_context; DECLARE_BITMAP(host_nodes, MAX_NODES + 1); HostMemPolicy policy; |