uipc_shm.c: make large page allocation interruptible

in cases there is no page pressure or when the user lost patience
waiting for very large allocation.  Other case is already handled by
vm_wait_intr().

Reported by:	"Lizzie from Eden Emulator project"
Reviewed by:	adrian, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D56725

This commit is contained in:

Konstantin Belousov

2026-04-28 05:34:49 +03:00

parent 8f46ba0651

commit 839d3266d8

1 changed files with 8 additions and 0 deletions

									
										sys/kern/uipc_shm.c
									
		+8
		
												View File
												
				@@ -829,12 +829,20 @@ shm_dotruncate_largepage(struct shmfd *shmfd, off_t length, void *rl_cookie)

					 * object lock might allowed mapping of them.

					 */

					while (object->size < newobjsz) {

						error = sig_intr();

						if (error != 0)

							return (error);

						m = vm_page_alloc_contig(object, object->size, aflags,

						    pagesizes[psind] / PAGE_SIZE, 0, ~0,

						    pagesizes[psind], 0,

						    VM_MEMATTR_DEFAULT);

						if (m == NULL) {

							VM_OBJECT_WUNLOCK(object);

							error = sig_intr();

							if (error != 0) {

								VM_OBJECT_WLOCK(object);

								return (error);

							}

							if (shmfd->shm_lp_alloc_policy ==

							    SHM_LARGEPAGE_ALLOC_NOWAIT ||

							    (shmfd->shm_lp_alloc_policy ==