fio: Add advise THP option to mmap engine

[fio.git] / engines / mmap.c

diff --git a/engines/mmap.c b/engines/mmap.c
index 308b4665444cd619b73e6f5c3aeefbed78e56002..55ba1ab36c9a163bec27a788ee05497ef94c6cad 100644 (file)
--- a/engines/mmap.c
+++ b/engines/mmap.c
@@ -11,6 +11,7 @@
 #include <sys/mman.h>
 
 #include "../fio.h"
+#include "../optgroup.h"
 #include "../verify.h"
 
 /*
@@ -26,11 +27,40 @@ struct fio_mmap_data {
        off_t mmap_off;
 };
 
+#ifdef CONFIG_HAVE_THP
+struct mmap_options {
+       void *pad;
+       unsigned int thp;
+};
+
+static struct fio_option options[] = {
+       {
+               .name   = "thp",
+               .lname  = "Transparent Huge Pages",
+               .type   = FIO_OPT_INT,
+               .off1   = offsetof(struct mmap_options, thp),
+               .help   = "Memory Advise Huge Page",
+               .category = FIO_OPT_C_ENGINE,
+               .group  = FIO_OPT_G_MMAP,
+       },
+       {
+               .name = NULL,
+       },
+};
+#endif
+
 static bool fio_madvise_file(struct thread_data *td, struct fio_file *f,
                             size_t length)
 
 {
        struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
+#ifdef CONFIG_HAVE_THP
+       struct mmap_options *o = td->eo;
+
+       /* Ignore errors on this optional advisory */
+       if (o->thp)
+               madvise(fmd->mmap_ptr, length, MADV_HUGEPAGE);
+#endif
 
        if (!td->o.fadvise_hint)
                return true;
@@ -50,11 +80,27 @@ static bool fio_madvise_file(struct thread_data *td, struct fio_file *f,
        return true;
 }
 
+#ifdef CONFIG_HAVE_THP
+static int fio_mmap_get_shared(struct thread_data *td)
+{
+       struct mmap_options *o = td->eo;
+
+       if (o->thp)
+               return MAP_PRIVATE;
+       return MAP_SHARED;
+}
+#else
+static int fio_mmap_get_shared(struct thread_data *td)
+{
+       return MAP_SHARED;
+}
+#endif
+
 static int fio_mmap_file(struct thread_data *td, struct fio_file *f,
                         size_t length, off_t off)
 {
        struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
-       int flags = 0;
+       int flags = 0, shared = fio_mmap_get_shared(td);
 
        if (td_rw(td) && !td->o.verify_only)
                flags = PROT_READ | PROT_WRITE;
@@ -66,7 +112,7 @@ static int fio_mmap_file(struct thread_data *td, struct fio_file *f,
        } else
                flags = PROT_READ;
 
-       fmd->mmap_ptr = mmap(NULL, length, flags, MAP_SHARED, f->fd, off);
+       fmd->mmap_ptr = mmap(NULL, length, flags, shared, f->fd, off);
        if (fmd->mmap_ptr == MAP_FAILED) {
                fmd->mmap_ptr = NULL;
                td_verror(td, errno, "mmap");
@@ -275,6 +321,10 @@ static struct ioengine_ops ioengine = {
        .close_file     = fio_mmapio_close_file,
        .get_file_size  = generic_get_file_size,
        .flags          = FIO_SYNCIO | FIO_NOEXTEND,
+#ifdef CONFIG_HAVE_THP
+       .options        = options,
+       .option_struct_size = sizeof(struct mmap_options),
+#endif
 };
 
 static void fio_init fio_mmapio_register(void)