[LTP] [PATCH 05/29] Hugetlb: Migrating libhugetlbfs directio

[Cyril Hrubis]

Hi!
> Migrating the libhugetlbfs/testcases/direct.c test
> 
> Test Description: This Test perform Direct Write/Read from/To hugetlbfs
> file which is mapped to process address space. The test is checking if it
> succeeds and data written or read is not corrupted.
> 
> Signed-off-by: Tarun Sahu <tsahu@linux.ibm.com>
> ---
>  runtest/hugetlb                               |   1 +
>  testcases/kernel/mem/.gitignore               |   1 +
>  .../kernel/mem/hugetlb/hugemmap/hugemmap11.c  | 111 ++++++++++++++++++
>  3 files changed, 113 insertions(+)
>  create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap11.c
> 
> diff --git a/runtest/hugetlb b/runtest/hugetlb
> index 8a56d52a3..b9ee7227d 100644
> --- a/runtest/hugetlb
> +++ b/runtest/hugetlb
> @@ -7,6 +7,7 @@ hugemmap07 hugemmap07
>  hugemmap08 hugemmap08
>  hugemmap09 hugemmap09
>  hugemmap10 hugemmap10
> +hugemmap11 hugemmap11
>  hugemmap05_1 hugemmap05 -m
>  hugemmap05_2 hugemmap05 -s
>  hugemmap05_3 hugemmap05 -s -m
> diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore
> index e7def68cb..3e64b67be 100644
> --- a/testcases/kernel/mem/.gitignore
> +++ b/testcases/kernel/mem/.gitignore
> @@ -8,6 +8,7 @@
>  /hugetlb/hugemmap/hugemmap08
>  /hugetlb/hugemmap/hugemmap09
>  /hugetlb/hugemmap/hugemmap10
> +/hugetlb/hugemmap/hugemmap11
>  /hugetlb/hugeshmat/hugeshmat01
>  /hugetlb/hugeshmat/hugeshmat02
>  /hugetlb/hugeshmat/hugeshmat03
> diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap11.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap11.c
> new file mode 100644
> index 000000000..c4dbe76e6
> --- /dev/null
> +++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap11.c
> @@ -0,0 +1,111 @@
> +// SPDX-License-Identifier: LGPL-2.1-or-later
> +/*
> + * Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation.
> + *
> + * Test Name: Direct I/O
> + *
> + * Test Description: This Test perform Direct Write/Read from/To hugetlbfs file
> + * which is mapped to process address space. The test is checking if it
> + * succeeds and data written or read is not corrupted.

Here as well, documentation comment.

> + * HISTORY
> + *  Written by David Gibson & Adam Litke
> + *
> + */
> +
> +#define _GNU_SOURCE
> +#include <stdio.h>
> +#include <sys/mount.h>
> +#include <limits.h>
> +#include <sys/param.h>
> +#include <sys/types.h>
> +
> +#include "hugetlb.h"
> +
> +#define P0 "ffffffff"
> +#define IOSZ 4096
> +#define NHFILE "ltp_nfile"
> +
> +static char buf[IOSZ] __attribute__((aligned(IOSZ)));

There is no need for this buffer to be global.

> +static int  fd = -1, nfd = -1;
> +static char hfile[MAXPATHLEN];
> +static long hpage_size;
> +
> +static void run_test(void)
> +{
> +	void *p;
> +
> +	fd = SAFE_OPEN(hfile, O_RDWR | O_CREAT, 0600);
> +	SAFE_UNLINK(hfile);
> +
> +	nfd = SAFE_OPEN(NHFILE, O_CREAT|O_EXCL|O_RDWR|O_DIRECT, 0600);
> +	SAFE_UNLINK(NHFILE);
> +
> +	p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
> +	memcpy(p, P0, 8);
> +
> +	/* Direct write from huge page */
> +	SAFE_WRITE(1, nfd, p, IOSZ);
> +	SAFE_LSEEK(nfd, 0, SEEK_SET);
> +
> +	/* Check for accuracy */
> +	SAFE_READ(1, nfd, buf, IOSZ);
> +	if (memcmp(P0, buf, 8)) {
> +		tst_res(TFAIL, "Memory mismatch after Direct-IO write");
> +		goto fail;
> +	}
> +	SAFE_LSEEK(nfd, 0, SEEK_SET);
> +
> +	/* Direct read to huge page */
> +	memset(p, 0, IOSZ);
> +	SAFE_READ(1, nfd, p, IOSZ);
> +
> +	/* Check for accuracy */
> +	if (memcmp(p, P0, 8)) {
> +		tst_res(TFAIL, "Memory mismatch after Direct-IO read");
> +		goto fail;
> +	}
> +	tst_res(TPASS, "Successfully tested Hugepage Direct I/O");
> +	SAFE_MUNMAP(p, hpage_size);
> +	SAFE_CLOSE(fd);
> +	SAFE_CLOSE(nfd);
> +	return;
> +fail:
> +	tst_brk(TBROK, "Once failed, No point in continuing the test");

Here as well.

> +}
> +
> +static void setup(void)
> +{
> +	if (tst_hugepages < 1)
> +		tst_brk(TCONF, "Not enough hugepages for testing.");
> +
> +	if (!Hopt)
> +		Hopt = tst_get_tmpdir();
> +	SAFE_MOUNT("none", Hopt, "hugetlbfs", 0, NULL);
> +
> +	snprintf(hfile, sizeof(hfile), "%s/ltp_hugetlbfile%d", Hopt, getpid());
> +	hpage_size = SAFE_READ_MEMINFO("Hugepagesize:")*1024;
> +}
> +
> +static void cleanup(void)
> +{
> +	if (fd >= 0)
> +		SAFE_CLOSE(fd);
> +	if (nfd >= 0)
> +		SAFE_CLOSE(nfd);
> +	umount2(Hopt, MNT_DETACH);

Here as well.

> +}
> +
> +static struct tst_test test = {
> +	.needs_root = 1,
> +	.needs_tmpdir = 1,
> +	.options = (struct tst_option[]) {
> +		{"H:", &Hopt,   "Location of hugetlbfs, i.e.  -H /var/hugetlbfs"},
> +		{"s:", &nr_opt, "Set the number of the been allocated hugepages"},
> +		{}
> +	},
> +	.setup = setup,
> +	.cleanup = cleanup,
> +	.test_all = run_test,
> +	.hugepages = {1, TST_REQUEST},
> +};
> -- 
> 2.31.1
> 
> 
> -- 
> Mailing list info: https://lists.linux.it/listinfo/ltp

-- 
Cyril Hrubis
chrubis@suse.cz