David Hildenbrand a384bfa32e util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc() ... Let's sense support and use it for preallocation. MADV_POPULATE_WRITE does not require a SIGBUS handler, doesn't actually touch page content, and avoids context switches; it is, therefore, faster and easier to handle than our current approach. While MADV_POPULATE_WRITE is, in general, faster than manual prefaulting, and especially faster with 4k pages, there is still value in prefaulting using multiple threads to speed up preallocation. More details on MADV_POPULATE_WRITE can be found in the 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 proposal [1]. This resolves the TODO in do_touch_pages(). In the future, we might want to look into using fallocate(), eventually combined with MADV_POPULATE_READ, when dealing with shared file/fd mappings and not caring about memory bindings. [1] https://lkml.kernel.org/r/20210816081922.5155-1-david@redhat.com Reviewed-by: Pankaj Gupta <pankaj.gupta@ionos.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20211217134611.31172-3-david@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>		2022-01-07 05:19:55 -05:00
..
accel.h	accel-cpu: make cpu_realizefn return a bool	2021-05-10 15:41:50 -04:00
atomic128.h	docs: fix references to docs/devel/atomics.rst	2021-06-02 06:51:09 +02:00
atomic.h	qemu/atomic: Add aligned_{int64,uint64}_t types	2021-07-21 07:45:38 -10:00
base64.h	nomaintainer: Fix Lesser GPL version number	2020-11-15 17:04:40 +01:00
bcd.h	Clean up decorations and whitespace around header guards	2016-07-12 16:20:46 +02:00
bitmap.h	bitmap: Add bitmap_copy_with_{src|dst}_offset()	2019-07-15 15:39:02 +02:00
bitops.h	bitops.h: revert db1ffc32dd ("qemu/bitops.h: add bitrev8 implementation")	2021-07-26 06:56:41 -10:00
bswap.h	include/qemu/bswap.h: Handle being included outside extern "C" block	2021-05-10 17:21:54 +01:00
buffer.h	nomaintainer: Fix Lesser GPL version number	2020-11-15 17:04:40 +01:00
cacheflush.h	util: Enhance flush_icache_range with separate data pointer	2021-01-07 05:09:41 -10:00
co-shared-resource.h	co-shared-resource: protect with a mutex	2021-06-25 14:24:24 +03:00
compiler.h	configure: Remove probe for _Static_assert	2021-06-16 15:03:26 +02:00
config-file.h	qemu-config: parse configuration files to a QDict	2021-06-04 13:50:01 +02:00
coroutine_int.h	coroutine: support SafeStack in ucontext backend	2020-06-23 15:46:05 +01:00
coroutine.h	co-queue: drop extra coroutine_fn marks	2021-06-18 10:59:52 -05:00
cpuid.h	util: add util function buffer_zero_avx512()	2020-03-16 23:02:21 +01:00
crc32c.h	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
crc-ccitt.h	util: Add CRC16 (CCITT) calculation routines	2021-01-24 20:10:54 +01:00
ctype.h	qemu-common: Move qemu_isalnum() etc. to qemu/ctype.h	2019-06-11 20:22:09 +02:00
cutils.h	ui/dbus: add p2p=on/off option	2021-12-21 10:50:22 +04:00
datadir.h	vl: extract softmmu/datadir.c	2020-12-10 12:15:18 -05:00
dbus.h	ui/dbus: add chardev backend & interface	2021-12-21 10:50:22 +04:00
drm.h	Clean up ill-advised or unusual header guards	2019-05-13 08:58:55 +02:00
envlist.h	misc: move include files to include/qemu/	2012-12-19 08:32:39 +01:00
error-report.h	error: rename error_with_timestamp to message_with_timestamp	2021-02-01 10:50:55 +00:00
event_notifier.h	event_notifier: handle initialization failure better	2021-02-08 14:43:55 +01:00
fifo8.h	utils/fifo8: add VMSTATE_FIFO8_TEST macro	2021-02-07 20:38:34 +00:00
fifo32.h	hw: Clean up includes	2016-06-07 18:19:23 +03:00
filemonitor.h	nomaintainer: Fix Lesser GPL version number	2020-11-15 17:04:40 +01:00
futex.h	futex: add missing header guards	2017-10-16 20:57:13 +03:00
guest-random.h	util: Add qemu_guest_getrandom and associated routines	2019-05-22 12:38:54 -04:00
hbitmap.h	block/dirty-bitmap: improve _next_dirty_area API	2020-03-18 14:03:46 -04:00
help_option.h	keyval: Parse help options	2020-10-15 16:06:27 +02:00
host-utils.h	host-utils: Introduce mulu128	2021-11-09 10:32:52 +11:00
id.h	net: Use id_generate() in the network subsystem, too	2021-03-09 21:47:45 +01:00
int128.h	qemu/int128: Add int128_{not,xor}	2021-10-27 17:10:00 -07:00
iov.h	util/iov: make qemu_iovec_init_extended() honest	2021-02-03 08:00:33 -06:00
iova-tree.h	util: Make some iova_tree parameters const	2021-11-02 15:57:21 +01:00
jhash.h	Clean up ill-advised or unusual header guards	2019-05-13 08:58:55 +02:00
job.h	job: Add job_cancel_requested()	2021-10-07 10:42:40 +02:00
lockable.h	include/qemu/lockable: Use _Generic instead of QEMU_GENERIC	2021-06-16 15:03:26 +02:00
log-for-trace.h	log-for-trace.h: Split out parts of log.h used by trace.h	2018-03-12 11:10:20 +00:00
log.h	qemu/atomic.h: rename atomic_ to qatomic_	2020-09-23 16:07:44 +01:00
main-loop.h	util/async: add a human-readable name to BHs for debugging	2021-07-05 11:40:32 +01:00
memfd.h	linux-user: add memfd_create	2019-09-11 08:46:17 +02:00
mmap-alloc.h	util/mmap-alloc: Pass flags instead of separate bools to qemu_ram_mmap()	2021-06-15 20:27:38 +02:00
module.h	docs: remove non-reference uses of single backticks	2021-11-08 12:27:23 +04:00
notify.h	xen / notify: introduce a new XenWatchList abstraction	2019-09-24 12:18:47 +01:00
nvdimm-utils.h	Clean up includes	2020-12-10 17:16:44 +01:00
option_int.h	qemu/queue.h: simplify reverse access to QTAILQ	2019-01-11 15:46:55 +01:00
option.h	option: add g_auto for QemuOpts	2021-12-21 10:50:22 +04:00
osdep.h	util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc()	2022-01-07 05:19:55 -05:00
path.h	Clean up decorations and whitespace around header guards	2016-07-12 16:20:46 +02:00
plugin-memory.h	plugins: fix-up handling of internal hostaddr for 32 bit	2021-07-14 14:33:53 +01:00
plugin.h	plugins: try and make plugin_insn_append more ergonomic	2021-11-04 10:32:01 +00:00
pmem.h	Clean up decorations and whitespace around header guards	2019-05-13 08:58:55 +02:00
processor.h	Drop remaining bits of ia64 host support	2018-02-05 18:09:45 +01:00
progress_meter.h	progressmeter: protect with a mutex	2021-06-25 14:24:24 +03:00
qdist.h	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
qemu-options.h	remove qemu-options* from root directory	2021-05-26 14:49:46 +02:00
qemu-plugin.h	plugins/api: added a boolean parsing plugin api	2021-09-02 11:29:34 +01:00
qemu-print.h	qemu-print: New qemu_fprintf(), qemu_vfprintf()	2019-04-18 22:18:59 +02:00
qht.h	qht: constify qht_statistics_init	2018-09-26 08:55:54 -07:00
qsp.h	qsp: Simplify how qsp_report() prints	2019-04-18 22:18:59 +02:00
queue.h	qemu/atomic.h: rename atomic_ to qatomic_	2020-09-23 16:07:44 +01:00
range.h	Include qemu/queue.h slightly less	2019-08-16 13:31:52 +02:00
ratelimit.h	ratelimit: treat zero speed as unlimited	2021-06-25 14:22:21 +03:00
rcu_queue.h	qemu/atomic.h: rename atomic_ to qatomic_	2020-09-23 16:07:44 +01:00
rcu.h	rcu: Introduce force_rcu notifier	2021-11-10 13:20:15 +01:00
readline.h	readline: add a free function	2018-01-16 14:54:50 +01:00
selfmap.h	Remove leading underscores from QEMU defines	2021-06-21 05:49:01 +02:00
seqlock.h	qemu/atomic.h: rename atomic_ to qatomic_	2020-09-23 16:07:44 +01:00
sockets.h	qemu-sockets: introduce socket_address_parse_named_fd()	2021-06-18 10:59:53 -05:00
stats64.h	qemu/atomic: Add aligned_{int64,uint64}_t types	2021-07-21 07:45:38 -10:00
sys_membarrier.h	Normalize header guard symbol definition.	2019-05-13 08:58:55 +02:00
systemd.h	Normalize header guard symbol definition.	2019-05-13 08:58:55 +02:00
thread-posix.h	util: Use unique type for QemuRecMutex in thread-posix.h	2021-06-16 15:03:26 +02:00
thread-win32.h	util: Use real functions for thread-posix QemuRecMutex	2021-06-16 15:03:26 +02:00
thread.h	util: Pass file+line to qemu_rec_mutex_unlock_impl	2021-06-16 15:03:26 +02:00
throttle-options.h	block: add throttle block filter driver	2017-09-06 10:12:02 +02:00
throttle.h	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
timed-average.h	include: Clean up includes	2016-02-23 12:43:05 +00:00
timer.h	spapr: rollback 'unplug timeout' for CPU hotunplugs	2021-04-12 12:27:14 +10:00
transactions.h	transactions: Invoke clean() after everything else	2021-11-16 09:43:44 +01:00
tsan.h	include/qemu: Added tsan.h for annotations.	2020-06-16 14:49:05 +01:00
typedefs.h	exec: Move TranslationBlock typedef to qemu/typedefs.h	2021-02-18 08:19:08 +00:00
unicode.h	json: Reject invalid UTF-8 sequences	2018-08-24 20:26:37 +02:00
units.h	block: Eliminate the S_1KiB, S_2KiB, ... macros	2019-02-01 13:46:45 +01:00
uri.h	Remove unused function declarations	2016-09-15 15:32:22 +03:00
userfaultfd.h	migration: introduce UFFD-WP low-level interface helpers	2021-02-08 11:19:51 +00:00
uuid.h	acpi: nvdimm: change NVDIMM_UUID_LE to a common macro	2020-05-14 15:03:08 +01:00
vfio-helpers.h	util/vfio-helpers: Pass Error handle to qemu_vfio_dma_map()	2021-09-07 09:08:24 +01:00
vhost-user-server.h	libvhost-user: make it a meson subproject	2020-12-08 13:48:58 -05:00
win_dump_defs.h	dump: move Windows dump structures definitions	2018-10-02 19:09:12 +02:00
xattr.h	include: Fix typos found by codespell	2017-01-24 23:26:52 +03:00
xxhash.h	target/arm: Implement an IMPDEF pauth algorithm	2021-01-19 14:38:51 +00:00
yank.h	yank: Remove dependency on qiochannel	2021-04-01 15:27:44 +04:00