[PATCH v1 0/3] util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc()

[David Hildenbrand <david@redhat.com>]

#1 adds support for MADV_POPULATE_WRITE, #2 cleans up the code to avoid
global variables and prepare for concurrency and #3 makes os_mem_prealloc()
safe to be called from multiple threads concurrently.

Details regarding MADV_POPULATE_WRITE can be found in introducing upstream
Linux commit 4ca9b3859dac ("mm/madvise: introduce
MADV_POPULATE_(READ|WRITE) to prefault page tables") and in the latest man
page patch [1].

[1] https://lkml.kernel.org/r/20210712083917.16361-1-david@redhat.com

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: Marek Kedzierski <mkedzier@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>

David Hildenbrand (3):
  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: Support concurrent os_mem_prealloc() invocation

 include/qemu/osdep.h |   7 ++
 util/oslib-posix.c   | 167 ++++++++++++++++++++++++++++++-------------
 2 files changed, 126 insertions(+), 48 deletions(-)

-- 
2.31.1