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oslib-posix: initialize backend memory objects in parallel

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QEMU initializes preallocated backend memory as the objects are parsed from
the command line. This is not optimal in some cases (e.g. memory spanning
multiple NUMA nodes) because the memory objects are initialized in series.

Allow the initialization to occur in parallel (asynchronously). In order to
ensure optimal thread placement, asynchronous initialization requires prealloc
context threads to be in use.

Signed-off-by: Mark Kanda <mark.kanda@oracle.com>
Message-ID: <20240131165327.3154970-2-mark.kanda@oracle.com>
Tested-by: Mario Casquero <mcasquer@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
Mark Kanda
2024-01-31 10:53:27 -06:00
committed by David Hildenbrand
parent 540a1abbf0
commit 04accf43df
7 changed files with 145 additions and 37 deletions
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8
util/oslib-win32.c
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@@ -265,7 +265,7 @@ int getpagesize(void)
}
bool qemu_prealloc_mem(int fd, char *area, size_t sz, int max_threads,
ThreadContext *tc, Error **errp)
ThreadContext *tc, bool async, Error **errp)
{
int i;
size_t pagesize = qemu_real_host_page_size();
@@ -278,6 +278,12 @@ bool qemu_prealloc_mem(int fd, char *area, size_t sz, int max_threads,
return true;
}
bool qemu_finish_async_prealloc_mem(Error **errp)
{
/* async prealloc not supported, there is nothing to finish */
return true;
}
char *qemu_get_pid_name(pid_t pid)
{
/* XXX Implement me */