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os: add an ability to lock memory on_fault

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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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6
meson.build
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@ -2885,6 +2885,12 @@ config_host_data.set('HAVE_MLOCKALL', cc.links(gnu_source_prefix + '''
return mlockall(MCL_FUTURE);
}'''))
config_host_data.set('HAVE_MLOCK_ONFAULT', cc.links(gnu_source_prefix + '''
#include <sys/mman.h>
int main(void) {
return mlockall(MCL_FUTURE | MCL_ONFAULT);
}'''))
have_l2tpv3 = false
if get_option('l2tpv3').allowed() and have_system
have_l2tpv3 = cc.has_type('struct mmsghdr',