diff options
| -rw-r--r-- | src/shm.c | 12 | ||||
| -rw-r--r-- | src/surface.c | 14 |
2 files changed, 26 insertions, 0 deletions
@@ -34,7 +34,19 @@ static int create_shm_file(void) int shm_allocate_file(size_t size) { +#ifdef __linux__ + /* + * On linux, we can just use memfd_create(). This is both simpler and + * potentially allows usage of Transparent HugePages, which speed up + * the first paint of a large screen buffer. + * + * This isn't available on *BSD, which we could conceivably be running + * on. + */ + int fd = memfd_create("wl_shm", 0); +#else int fd = create_shm_file(); +#endif if (fd < 0) return -1; int ret; diff --git a/src/surface.c b/src/surface.c index e640c40..b8ed88e 100644 --- a/src/surface.c +++ b/src/surface.c @@ -32,6 +32,20 @@ void surface_init( MAP_SHARED, surface->shm_pool_fd, 0); +#ifdef __linux__ + /* + * On linux, ask for Transparent HugePages if available and our + * buffer's at least 2MiB. This can greatly speed up the first + * cairo_paint() by reducing page faults, but unfortunately is disabled + * for shared memory at the time of writing. + * + * MADV_HUGEPAGE isn't available on *BSD, which we could conceivably be + * running on. + */ + if (surface->shm_pool_size >= (2 << 20)) { + madvise(surface->shm_pool_data, surface->shm_pool_size, MADV_HUGEPAGE); + } +#endif surface->wl_shm_pool = wl_shm_create_pool( wl_shm, surface->shm_pool_fd, |