#1 is a preparation for improved error reporting, #2 adds support for
MADV_POPULATE_WRITE, #3 cleans up the code to avoid global variables and
prepare for concurrency, #4 and #5 optimize thread handling, #6 makes
os_mem_prealloc() safe to be called from multiple threads concurrently and
#7 makes the SIGBUS handler coexist cleanly with the MCE SIGBUS handler
under Linux.
Details regarding MADV_POPULATE_WRITE can be found in introducing upstream
Linux commits 4ca9b3859dac ("mm/madvise: introduce
MADV_POPULATE_(READ|WRITE) to prefault page tables") and eb2faa513c24
("mm/madvise: report SIGBUS as -EFAULT for MADV_POPULATE_(READ|WRITE)"),
and in the man page update [1].
v3 -> v4:
- Added ACKs
- "util/oslib-posix: Support concurrent os_mem_prealloc() invocation"
-- Remove stale comment from patch description
v2 -> v3:
- "util/oslib-posix: Let touch_all_pages() return an error"
-- Added
- Added ACKs/RBs
- "util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc()"
-- Set error code accordingly
v1 -> v2:
- "util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc()"
-- Handle thread with no data to initialize
-- Always set use_madv_populate_write properly
-- Add comment regarding future fallocate() optimization
- "util/oslib-posix: Don't create too many threads with small memory or
little pages"
-- Added
- "util/oslib-posix: Avoid creating a single thread with
MADV_POPULATE_WRITE"
-- Added
- "util/oslib-posix: Support concurrent os_mem_prealloc() invocation"
-- Add missing g_once_init_leave()
-- Move g_once_init_enter() to the place where it is actually needed
- "util/oslib-posix: Forward SIGBUS to MCE handler under Linux"
-- Added
[1] https://lkml.kernel.org/r/20210823120645.8223-1-da...@redhat.com
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: "Michael S. Tsirkin" <m...@redhat.com>
Cc: Igor Mammedov <imamm...@redhat.com>
Cc: Eduardo Habkost <ehabk...@redhat.com>
Cc: Dr. David Alan Gilbert <dgilb...@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.li...@gmail.com>
Cc: Daniel P. Berrangé <berra...@redhat.com>
David Hildenbrand (7):
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
include/qemu/osdep.h | 7 ++
softmmu/cpus.c | 4 +
util/oslib-posix.c | 231 ++++++++++++++++++++++++++++++++-----------
3 files changed, 187 insertions(+), 55 deletions(-)
--
2.31.1
