* [Qemu-devel] [PATCH 1/2] qemu-options: document missing memory-backend-file options
2017-11-28 16:15 [Qemu-devel] [PATCH 0/2] qemu-options: document missing memory backend items Stefan Hajnoczi
@ 2017-11-28 16:15 ` Stefan Hajnoczi
2017-11-28 16:15 ` [Qemu-devel] [PATCH 2/2] qemu-options: document memory-backend-ram Stefan Hajnoczi
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Stefan Hajnoczi @ 2017-11-28 16:15 UTC (permalink / raw)
To: qemu-devel; +Cc: Eduardo Habkost, Igor Mammedov, Hu Tao, Stefan Hajnoczi
This patch adds undocumented memory-backend-file options to the
documentation.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
qemu-options.hx | 48 +++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 41 insertions(+), 7 deletions(-)
diff --git a/qemu-options.hx b/qemu-options.hx
index 3728e9b4dd..f2cf0be193 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4189,18 +4189,24 @@ property must be set. These objects are placed in the
@table @option
-@item -object memory-backend-file,id=@var{id},size=@var{size},mem-path=@var{dir},share=@var{on|off},discard-data=@var{on|off}
+@item -object memory-backend-file,id=@var{id},size=@var{size},mem-path=@var{dir},share=@var{on|off},discard-data=@var{on|off},merge=@var{on|off},dump=@var{on|off},prealloc=@var{on|off},host-nodes=@var{host-nodes},policy=@var{default|preferred|bind|interleave}
Creates a memory file backend object, which can be used to back
-the guest RAM with huge pages. The @option{id} parameter is a
-unique ID that will be used to reference this memory region
-when configuring the @option{-numa} argument. The @option{size}
-option provides the size of the memory region, and accepts
-common suffixes, eg @option{500M}. The @option{mem-path} provides
-the path to either a shared memory or huge page filesystem mount.
+the guest RAM with huge pages.
+
+The @option{id} parameter is a unique ID that will be used to reference this
+memory region when configuring the @option{-numa} argument.
+
+The @option{size} option provides the size of the memory region, and accepts
+common suffixes, eg @option{500M}.
+
+The @option{mem-path} provides the path to either a shared memory or huge page
+filesystem mount.
+
The @option{share} boolean option determines whether the memory
region is marked as private to QEMU, or shared. The latter allows
a co-operating external process to access the QEMU memory region.
+
Setting the @option{discard-data} boolean option to @var{on}
indicates that file contents can be destroyed when QEMU exits,
to avoid unnecessarily flushing data to the backing file. Note
@@ -4208,6 +4214,34 @@ that @option{discard-data} is only an optimization, and QEMU
might not discard file contents if it aborts unexpectedly or is
terminated using SIGKILL.
+The @option{merge} boolean option enables memory merge, also known as
+MADV_MERGEABLE, so that Kernel Samepage Merging will consider the pages for
+memory deduplication.
+
+Setting the @option{dump} boolean option to @var{off} excludes the memory from
+core dumps. This feature is also known as MADV_DONTDUMP.
+
+The @option{prealloc} boolean option enables memory preallocation.
+
+The @option{host-nodes} option binds the memory range to a list of NUMA host
+nodes.
+
+The @option{policy} option sets the NUMA policy to one of the following values:
+
+@table @option
+@item @var{default}
+default host policy
+
+@item @var{preferred}
+prefer the given host node list for allocation
+
+@item @var{bind}
+restrict memory allocation to the given host node list
+
+@item @var{interleave}
+interleave memory allocations across the given host node list
+@end table
+
@item -object rng-random,id=@var{id},filename=@var{/dev/random}
Creates a random number generator backend which obtains entropy from
--
2.14.3
^ permalink raw reply related [flat|nested] 5+ messages in thread* [Qemu-devel] [PATCH 2/2] qemu-options: document memory-backend-ram
2017-11-28 16:15 [Qemu-devel] [PATCH 0/2] qemu-options: document missing memory backend items Stefan Hajnoczi
2017-11-28 16:15 ` [Qemu-devel] [PATCH 1/2] qemu-options: document missing memory-backend-file options Stefan Hajnoczi
@ 2017-11-28 16:15 ` Stefan Hajnoczi
2017-11-28 16:41 ` [Qemu-devel] [PATCH 0/2] qemu-options: document missing memory backend items Eric Blake
2017-11-28 18:27 ` Eduardo Habkost
3 siblings, 0 replies; 5+ messages in thread
From: Stefan Hajnoczi @ 2017-11-28 16:15 UTC (permalink / raw)
To: qemu-devel; +Cc: Eduardo Habkost, Igor Mammedov, Hu Tao, Stefan Hajnoczi
The documentation should mention -object memory-backend-ram.
Suggested-by: Yumei Huang <yuhuang@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
qemu-options.hx | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/qemu-options.hx b/qemu-options.hx
index f2cf0be193..65123ae177 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4242,6 +4242,13 @@ restrict memory allocation to the given host node list
interleave memory allocations across the given host node list
@end table
+@item -object memory-backend-ram,id=@var{id},merge=@var{on|off},dump=@var{on|off},prealloc=@var{on|off},size=@var{size},host-nodes=@var{host-nodes},policy=@var{default|preferred|bind|interleave}
+
+Creates a memory backend object, which can be used to back the guest RAM.
+Memory backend objects offer more control than the @option{-m} option that is
+traditionally used to define guest RAM. Please refer to
+@option{memory-backend-file} for a description of the options.
+
@item -object rng-random,id=@var{id},filename=@var{/dev/random}
Creates a random number generator backend which obtains entropy from
--
2.14.3
^ permalink raw reply related [flat|nested] 5+ messages in thread