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os: add an ability to lock memory on_fault

Browse source 
This will be used in the following commits to make it possible to only
lock memory on fault instead of right away.

Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Link: https://lore.kernel.org/r/20250212143920.1269754-2-d-tatianin@yandex-team.ru
[peterx: fail os_mlock(on_fault=1) when not supported]
[peterx: use G_GNUC_UNUSED instead of "(void)on_fault", per Dan]
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Daniil Tatianin 2025-02-12 17:39:17 +03:00 • committed by Peter Xu
parent 30943e496f
commit e76fadf93e
6 changed files with 23 additions and 6 deletions
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15
os-posix.c
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@ -327,18 +327,29 @@ void os_set_line_buffering(void)
setvbuf(stdout, NULL, _IOLBF, 0);
}
int os_mlock(void)
int os_mlock(bool on_fault)
{
#ifdef HAVE_MLOCKALL
int ret = 0;
int flags = MCL_CURRENT | MCL_FUTURE;
ret = mlockall(MCL_CURRENT | MCL_FUTURE);
if (on_fault) {
#ifdef HAVE_MLOCK_ONFAULT
flags |= MCL_ONFAULT;
#else
error_report("mlockall: on_fault not supported");
return -EINVAL;
#endif
}
ret = mlockall(flags);
if (ret < 0) {
error_report("mlockall: %s", strerror(errno));
}
return ret;
#else
(void)on_fault;
return -ENOSYS;
#endif
}