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[PATCH v2 0/8] virtio-mem: Support "prealloc=on"
From: |
David Hildenbrand |
Subject: |
[PATCH v2 0/8] virtio-mem: Support "prealloc=on" |
Date: |
Fri, 17 Dec 2021 14:46:03 +0100 |
Based-on: <20211217134039.29670-1-david@redhat.com>
Support preallocation of memory to make virtio-mem safe to use with
scarce memory resources such as hugetlb. Before acknowledging a plug
request from the guest, we'll try preallcoating memory. If that fails,
we'll fail the request gracefully and warn the usr once.
To fully support huge pages for shared memory, we'll have to adjust shared
memory users, such as virtiofsd, to map guest memory via MAP_NORESERVE as
well, because otherwise, they'll end up overwriting the "reserve=off"
decision made by QEMU and try reserving huge pages for the sparse memory
region.
In the future, we might want to process guest requests, including
preallocating memory, asynchronously via a dedicated iothread.
[1] https://lkml.kernel.org/r/20211004120208.7409-1-david@redhat.com
v1 -> v2:
- Rebased
- Added RBs
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Daniel P. Berrangé <berrange@redhat.com>
Cc: Gavin Shan <gshan@redhat.com>
Cc: Hui Zhu <teawater@gmail.com>
Cc: Sebastien Boeuf <sebastien.boeuf@intel.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Michal Prívozník <mprivozn@redhat.com>
David Hildenbrand (8):
util/oslib-posix: Let touch_all_pages() return an error
util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc()
util/oslib-posix: Introduce and use MemsetContext for
touch_all_pages()
util/oslib-posix: Don't create too many threads with small memory or
little pages
util/oslib-posix: Avoid creating a single thread with
MADV_POPULATE_WRITE
util/oslib-posix: Support concurrent os_mem_prealloc() invocation
util/oslib-posix: Forward SIGBUS to MCE handler under Linux
virtio-mem: Support "prealloc=on" option
hw/virtio/virtio-mem.c | 39 +++++-
include/hw/virtio/virtio-mem.h | 4 +
include/qemu/osdep.h | 7 +
softmmu/cpus.c | 4 +
util/oslib-posix.c | 231 +++++++++++++++++++++++++--------
5 files changed, 226 insertions(+), 59 deletions(-)
--
2.31.1
- [PATCH v2 0/8] virtio-mem: Support "prealloc=on",
David Hildenbrand <=
- [PATCH v2 2/8] util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc(), David Hildenbrand, 2021/12/17
- [PATCH v2 1/8] util/oslib-posix: Let touch_all_pages() return an error, David Hildenbrand, 2021/12/17
- [PATCH v2 3/8] util/oslib-posix: Introduce and use MemsetContext for touch_all_pages(), David Hildenbrand, 2021/12/17
- [PATCH v2 4/8] util/oslib-posix: Don't create too many threads with small memory or little pages, David Hildenbrand, 2021/12/17
- [PATCH v2 5/8] util/oslib-posix: Avoid creating a single thread with MADV_POPULATE_WRITE, David Hildenbrand, 2021/12/17
- [PATCH v2 7/8] util/oslib-posix: Forward SIGBUS to MCE handler under Linux, David Hildenbrand, 2021/12/17
- [PATCH v2 8/8] virtio-mem: Support "prealloc=on" option, David Hildenbrand, 2021/12/17
- [PATCH v2 6/8] util/oslib-posix: Support concurrent os_mem_prealloc() invocation, David Hildenbrand, 2021/12/17