Ditto, need to manual entry. On 9/18/25 12:53, Jaegeuk Kim via Linux-f2fs-devel wrote: > It only measures the read performance. > > Signed-off-by: Jaegeuk Kim <[email protected]> > --- > tools/f2fs_io/f2fs_io.c | 13 ++++++++++++- > 1 file changed, 12 insertions(+), 1 deletion(-) > > diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c > index 2d64eda81706..2ed9cb4184b8 100644 > --- a/tools/f2fs_io/f2fs_io.c > +++ b/tools/f2fs_io/f2fs_io.c > @@ -24,6 +24,8 @@ > #include <linux/fs.h> > #include <signal.h> > #include <stdarg.h> > +#include <sys/uio.h> > +#include <stdarg.h> > #include <stdbool.h> > #include <stdio.h> > #include <stdlib.h> > @@ -929,6 +931,7 @@ static void do_write_advice(int argc, char **argv, const > struct cmd_desc *cmd) > "Read data in file_path and print nbytes\n" \ > "IO can be\n" \ > " buffered : buffered IO\n" \ > +" dontcache: buffered IO + dontcache\n" \ > " dio : direct IO\n" \ > " mmap : mmap IO\n" \ > " mlock : mmap + mlock\n" \ > @@ -948,6 +951,7 @@ static void do_read(int argc, char **argv, const struct > cmd_desc *cmd) > int flags = 0; > int do_mmap = 0; > int do_mlock = 0; > + int do_dontcache = 0; > int fd, advice; > > if (argc != 8) { > @@ -972,6 +976,8 @@ static void do_read(int argc, char **argv, const struct > cmd_desc *cmd) > do_mmap = 1; > else if (!strcmp(argv[4], "mlock")) > do_mlock = 1; > + else if (!strcmp(argv[4], "dontcache")) > + do_dontcache = 1; > else if (strcmp(argv[4], "buffered")) > die("Wrong IO type"); > > @@ -1016,7 +1022,12 @@ static void do_read(int argc, char **argv, const > struct cmd_desc *cmd) > read_cnt = count * buf_size; > } else { > for (i = 0; i < count; i++) { > - ret = pread(fd, buf, buf_size, offset + buf_size * i); > + if (!do_dontcache) { > + ret = pread(fd, buf, buf_size, offset + > buf_size * i); > + } else { > + struct iovec iov = { .iov_base = buf, .iov_len > = buf_size }; > + ret = preadv2(fd, &iov, 1, offset + buf_size * > i, RWF_DONTCACHE); > + } > if (ret != buf_size) { > printf("pread expected: %"PRIu64", readed: > %"PRIu64"\n", > buf_size, ret);
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