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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
atomic.h qemu/atomic: Add aligned_{int64,uint64}_t types 2021-07-21 07:45:38 -10:00
atomic128.h docs: fix references to docs/devel/atomics.rst 2021-06-02 06:51:09 +02:00
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.h co-queue: drop extra coroutine_fn marks 2021-06-18 10:59:52 -05:00
coroutine_int.h coroutine: support SafeStack in ucontext backend 2020-06-23 15:46:05 +01:00
cpuid.h util: add util function buffer_zero_avx512() 2020-03-16 23:02:21 +01:00
crc-ccitt.h util: Add CRC16 (CCITT) calculation routines 2021-01-24 20:10:54 +01:00
crc32c.h Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
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.h option: add g_auto for QemuOpts 2021-12-21 10:50:22 +04:00
option_int.h qemu/queue.h: simplify reverse access to QTAILQ 2019-01-11 15:46:55 +01:00
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.h rcu: Introduce force_rcu notifier 2021-11-10 13:20:15 +01:00
rcu_queue.h qemu/atomic.h: rename atomic_ to qatomic_ 2020-09-23 16:07:44 +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