From: Konstantin Belousov <k...@freebsd.org> Created with shm_open2(SHM_LARGEPAGE) and then configured with FIOSSHMLPGCNF ioctl, largepages posix shared memory objects guarantee that all userspace mappings of it are served by superpage non-managed mappings.
Only amd64 for now, both 2M and 1G superpages can be requested, the later requires CPU feature. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D24652 --- newlib/libc/sys/rtems/include/sys/filio.h | 3 +++ newlib/libc/sys/rtems/include/sys/mman.h | 13 ++++++++++++- 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/newlib/libc/sys/rtems/include/sys/filio.h b/newlib/libc/sys/rtems/include/sys/filio.h index c5cf3d443..3eea7a7ac 100644 --- a/newlib/libc/sys/rtems/include/sys/filio.h +++ b/newlib/libc/sys/rtems/include/sys/filio.h @@ -70,6 +70,9 @@ struct fiobmap2_arg { }; /* Get the file's bmap info for the logical block bn. */ #define FIOBMAP2 _IOWR('f', 99, struct fiobmap2_arg) +/* POSIX shm largepage set/get config */ +#define FIOSSHMLPGCNF _IOW('f', 100, struct shm_largepage_conf) +#define FIOGSHMLPGCNF _IOR('f', 101, struct shm_largepage_conf) #ifdef _KERNEL #ifdef COMPAT_FREEBSD32 diff --git a/newlib/libc/sys/rtems/include/sys/mman.h b/newlib/libc/sys/rtems/include/sys/mman.h index 6d861422d..d726a80d6 100644 --- a/newlib/libc/sys/rtems/include/sys/mman.h +++ b/newlib/libc/sys/rtems/include/sys/mman.h @@ -192,6 +192,17 @@ */ #define SHM_ALLOW_SEALING 0x00000001 #define SHM_GROW_ON_WRITE 0x00000002 +#define SHM_LARGEPAGE 0x00000004 + +#define SHM_LARGEPAGE_ALLOC_DEFAULT 0 +#define SHM_LARGEPAGE_ALLOC_NOWAIT 1 +#define SHM_LARGEPAGE_ALLOC_HARD 2 + +struct shm_largepage_conf { + int psind; + int alloc_policy; + int pad[10]; +}; /* * Flags for memfd_create(). @@ -199,7 +210,6 @@ #define MFD_CLOEXEC 0x00000001 #define MFD_ALLOW_SEALING 0x00000002 -/* UNSUPPORTED */ #define MFD_HUGETLB 0x00000004 #define MFD_HUGE_MASK 0xFC000000 @@ -279,6 +289,7 @@ int shm_unlink(const char *); #endif #if __BSD_VISIBLE int memfd_create(const char *, unsigned int); +int shm_create_largepage(const char *, int, int, int, mode_t); int shm_rename(const char *, const char *, int); #endif __END_DECLS -- 2.35.3 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
