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Date:   Fri, 7 Apr 2023 12:24:37 +0300
From:   Mike Rapoport <rppt@linux.ibm.com>
To:     Peter Xu <peterx@redhat.com>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        David Hildenbrand <david@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Axel Rasmussen <axelrasmussen@google.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Leonardo Bras Soares Passos <lsoaresp@redhat.com>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Nadav Amit <nadav.amit@gmail.com>
Subject: Re: [PATCH 07/29] selftests/mm: Merge default_huge_page_size() into
 one
Message-ID: <ZC/hVYolgEzG/EW/@linux.ibm.com>
References: <20230330155707.3106228-1-peterx@redhat.com>
 <20230330160705.3106966-1-peterx@redhat.com>
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On Thu, Mar 30, 2023 at 12:07:05PM -0400, Peter Xu wrote:
> There're already 3 same definitions of the three functions.  Move it into
> vm_util.[ch].
> 
> Signed-off-by: Peter Xu <peterx@redhat.com>

Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>

> ---
>  tools/testing/selftests/mm/hugetlb-madvise.c | 25 +-------------------
>  tools/testing/selftests/mm/thuge-gen.c       | 19 +--------------
>  tools/testing/selftests/mm/userfaultfd.c     | 24 -------------------
>  tools/testing/selftests/mm/vm_util.c         | 21 ++++++++++++++++
>  tools/testing/selftests/mm/vm_util.h         |  1 +
>  5 files changed, 24 insertions(+), 66 deletions(-)
> 
> diff --git a/tools/testing/selftests/mm/hugetlb-madvise.c b/tools/testing/selftests/mm/hugetlb-madvise.c
> index 9a127a8fe176..28426e30d9bc 100644
> --- a/tools/testing/selftests/mm/hugetlb-madvise.c
> +++ b/tools/testing/selftests/mm/hugetlb-madvise.c
> @@ -18,6 +18,7 @@
>  #include <unistd.h>
>  #include <sys/mman.h>
>  #include <fcntl.h>
> +#include "vm_util.h"
> 
>  #define MIN_FREE_PAGES	20
>  #define NR_HUGE_PAGES	10	/* common number of pages to map/allocate */
> @@ -35,30 +36,6 @@
>  unsigned long huge_page_size;
>  unsigned long base_page_size;
> 
> -/*
> - * default_huge_page_size copied from mlock2-tests.c
> - */
> -unsigned long default_huge_page_size(void)
> -{
> -	unsigned long hps = 0;
> -	char *line = NULL;
> -	size_t linelen = 0;
> -	FILE *f = fopen("/proc/meminfo", "r");
> -
> -	if (!f)
> -		return 0;
> -	while (getline(&line, &linelen, f) > 0) {
> -		if (sscanf(line, "Hugepagesize:       %lu kB", &hps) == 1) {
> -			hps <<= 10;
> -			break;
> -		}
> -	}
> -
> -	free(line);
> -	fclose(f);
> -	return hps;
> -}
> -
>  unsigned long get_free_hugepages(void)
>  {
>  	unsigned long fhp = 0;
> diff --git a/tools/testing/selftests/mm/thuge-gen.c b/tools/testing/selftests/mm/thuge-gen.c
> index 361ef7192cc6..380ab5f0a534 100644
> --- a/tools/testing/selftests/mm/thuge-gen.c
> +++ b/tools/testing/selftests/mm/thuge-gen.c
> @@ -24,6 +24,7 @@
>  #include <unistd.h>
>  #include <stdarg.h>
>  #include <string.h>
> +#include "vm_util.h"
> 
>  #define err(x) perror(x), exit(1)
> 
> @@ -74,24 +75,6 @@ void find_pagesizes(void)
>  	globfree(&g);
>  }
> 
> -unsigned long default_huge_page_size(void)
> -{
> -	unsigned long hps = 0;
> -	char *line = NULL;
> -	size_t linelen = 0;
> -	FILE *f = fopen("/proc/meminfo", "r");
> -	if (!f)
> -		return 0;
> -	while (getline(&line, &linelen, f) > 0) {
> -		if (sscanf(line, "Hugepagesize:       %lu kB", &hps) == 1) {
> -			hps <<= 10;
> -			break;
> -		}
> -	}
> -	free(line);
> -	return hps;
> -}
> -
>  void show(unsigned long ps)
>  {
>  	char buf[100];
> diff --git a/tools/testing/selftests/mm/userfaultfd.c b/tools/testing/selftests/mm/userfaultfd.c
> index a96d126cb40e..4cc80a0e8955 100644
> --- a/tools/testing/selftests/mm/userfaultfd.c
> +++ b/tools/testing/selftests/mm/userfaultfd.c
> @@ -1703,30 +1703,6 @@ static int userfaultfd_stress(void)
>  		|| userfaultfd_events_test() || userfaultfd_minor_test();
>  }
> 
> -/*
> - * Copied from mlock2-tests.c
> - */
> -unsigned long default_huge_page_size(void)
> -{
> -	unsigned long hps = 0;
> -	char *line = NULL;
> -	size_t linelen = 0;
> -	FILE *f = fopen("/proc/meminfo", "r");
> -
> -	if (!f)
> -		return 0;
> -	while (getline(&line, &linelen, f) > 0) {
> -		if (sscanf(line, "Hugepagesize:       %lu kB", &hps) == 1) {
> -			hps <<= 10;
> -			break;
> -		}
> -	}
> -
> -	free(line);
> -	fclose(f);
> -	return hps;
> -}
> -
>  static void set_test_type(const char *type)
>  {
>  	if (!strcmp(type, "anon")) {
> diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c
> index 0204c469be43..12dc654b5be3 100644
> --- a/tools/testing/selftests/mm/vm_util.c
> +++ b/tools/testing/selftests/mm/vm_util.c
> @@ -180,3 +180,24 @@ int64_t allocate_transhuge(void *ptr, int pagemap_fd)
> 
>  	return -1;
>  }
> +
> +unsigned long default_huge_page_size(void)
> +{
> +	unsigned long hps = 0;
> +	char *line = NULL;
> +	size_t linelen = 0;
> +	FILE *f = fopen("/proc/meminfo", "r");
> +
> +	if (!f)
> +		return 0;
> +	while (getline(&line, &linelen, f) > 0) {
> +		if (sscanf(line, "Hugepagesize:       %lu kB", &hps) == 1) {
> +			hps <<= 10;
> +			break;
> +		}
> +	}
> +
> +	free(line);
> +	fclose(f);
> +	return hps;
> +}
> diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h
> index 6edeb531afc6..d7163fff8fb7 100644
> --- a/tools/testing/selftests/mm/vm_util.h
> +++ b/tools/testing/selftests/mm/vm_util.h
> @@ -35,6 +35,7 @@ bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
>  bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size);
>  bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size);
>  int64_t allocate_transhuge(void *ptr, int pagemap_fd);
> +unsigned long default_huge_page_size(void);
> 
>  /*
>   * On ppc64 this will only work with radix 2M hugepage size
> -- 
> 2.39.1
> 

-- 
Sincerely yours,
Mike.