As of Linux kernel commit 17e810229cb3 ("mm: support
POSIX_FADV_NOREUSE"), POSIX_FADV_NOREUSE hints at the LRU algorithm to
ignore accesses to mapped files with this flag. Previously, it was a
no-op.
Add it in fio as an fadvise_hint option to test the new behavior.
Signed-off-by: Yuanchu Xie <yuanchu@xxxxxxxxxx>
---
fio.h | 1 +
ioengines.c | 2 ++
options.c | 4 ++++
3 files changed, 7 insertions(+)
diff --git a/fio.h b/fio.h
index 32535517..f2acd430 100644
--- a/fio.h
+++ b/fio.h
@@ -163,6 +163,7 @@ enum {
F_ADV_TYPE,
F_ADV_RANDOM,
F_ADV_SEQUENTIAL,
+ F_ADV_NOREUSE,
};
/*
diff --git a/ioengines.c b/ioengines.c
index e2316ee4..56759c53 100644
--- a/ioengines.c
+++ b/ioengines.c
@@ -565,6 +565,8 @@ int td_io_open_file(struct thread_data *td, struct fio_file *f)
flags = POSIX_FADV_RANDOM;
else if (td->o.fadvise_hint == F_ADV_SEQUENTIAL)
flags = POSIX_FADV_SEQUENTIAL;
+ else if (td->o.fadvise_hint == F_ADV_NOREUSE)
+ flags = POSIX_FADV_NOREUSE;
else {
log_err("fio: unknown fadvise type %d\n",
td->o.fadvise_hint);
diff --git a/options.c b/options.c
index 18857795..fe580ebb 100644
--- a/options.c
+++ b/options.c
@@ -2740,6 +2740,10 @@ struct fio_option fio_options[FIO_MAX_OPTS] = {
.oval = F_ADV_SEQUENTIAL,
.help = "Advise using FADV_SEQUENTIAL",
},
+ { .ival = "noreuse",
+ .oval = F_ADV_NOREUSE,
+ .help = "Advise using FADV_NOREUSE",
+ },
},
.help = "Use fadvise() to advise the kernel on IO pattern",
.def = "1",
--
2.40.0.348.gf938b09366-goog
