Add appropriate warning in mmap engine for large maps failing

[fio.git] / engines / mmap.c

diff --git a/engines/mmap.c b/engines/mmap.c
index dffad90bbff8b2d357f9690b16c391cce1989da2..5b8d800c4190177ff33db12681a87c2659105761 100644 (file)
--- a/engines/mmap.c
+++ b/engines/mmap.c
@@ -79,8 +79,12 @@ static int fio_mmapio_open(struct thread_data *td, struct fio_file *f)
 
        f->mmap = mmap(NULL, f->io_size, flags, MAP_SHARED, f->fd, f->file_offset);
        if (f->mmap == MAP_FAILED) {
+               int err = errno;
+
                f->mmap = NULL;
-               td_verror(td, errno, "mmap");
+               td_verror(td, err, "mmap");
+               if (err == EINVAL && f->io_size > 2*1024*1024*1024UL)
+                       log_err("fio: mmap size likely too large\n");
                goto err;
        }