The patch titled
Subject: selftests/mm: export get_free_hugepages()
has been added to the -mm mm-unstable branch. Its filename is
selftests-mm-export-get_free_hugepages.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-export-get_free_hugepages.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Breno Leitao <leitao@xxxxxxxxxx>
Subject: selftests/mm: export get_free_hugepages()
Date: Thu, 5 Oct 2023 09:39:21 -0700
Patch series "New selftest for mm", v2.
This is a simple test case that reproduces an mm problem[1], where a page
fault races with madvise(), and it is not trivial to reproduce and debug.
This test-case aims to avoid such race problems from happening again,
impacting workloads that leverages external allocators, such as tcmalloc,
jemalloc, etc.
[1] https://lore.kernel.org/all/20231001005659.2185316-1-riel@xxxxxxxxxxx/#r
This patch (of 2):
get_free_hugepages() is helpful for other hugepage tests. Export it to
the common file (vm_util.c) to be reused.
Link: https://lkml.kernel.org/r/20231005163922.87568-1-leitao@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20231005163922.87568-2-leitao@xxxxxxxxxx
Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/hugetlb-madvise.c | 19 -----------------
tools/testing/selftests/mm/vm_util.c | 19 +++++++++++++++++
tools/testing/selftests/mm/vm_util.h | 1
3 files changed, 20 insertions(+), 19 deletions(-)
--- a/tools/testing/selftests/mm/hugetlb-madvise.c~selftests-mm-export-get_free_hugepages
+++ a/tools/testing/selftests/mm/hugetlb-madvise.c
@@ -36,25 +36,6 @@
unsigned long huge_page_size;
unsigned long base_page_size;
-unsigned long get_free_hugepages(void)
-{
- unsigned long fhp = 0;
- char *line = NULL;
- size_t linelen = 0;
- FILE *f = fopen("/proc/meminfo", "r");
-
- if (!f)
- return fhp;
- while (getline(&line, &linelen, f) > 0) {
- if (sscanf(line, "HugePages_Free: %lu", &fhp) == 1)
- break;
- }
-
- free(line);
- fclose(f);
- return fhp;
-}
-
void write_fault_pages(void *addr, unsigned long nr_pages)
{
unsigned long i;
--- a/tools/testing/selftests/mm/vm_util.c~selftests-mm-export-get_free_hugepages
+++ a/tools/testing/selftests/mm/vm_util.c
@@ -269,3 +269,22 @@ int uffd_unregister(int uffd, void *addr
return ret;
}
+
+unsigned long get_free_hugepages(void)
+{
+ unsigned long fhp = 0;
+ char *line = NULL;
+ size_t linelen = 0;
+ FILE *f = fopen("/proc/meminfo", "r");
+
+ if (!f)
+ return fhp;
+ while (getline(&line, &linelen, f) > 0) {
+ if (sscanf(line, "HugePages_Free: %lu", &fhp) == 1)
+ break;
+ }
+
+ free(line);
+ fclose(f);
+ return fhp;
+}
--- a/tools/testing/selftests/mm/vm_util.h~selftests-mm-export-get_free_hugepages
+++ a/tools/testing/selftests/mm/vm_util.h
@@ -51,6 +51,7 @@ int uffd_register(int uffd, void *addr,
int uffd_unregister(int uffd, void *addr, uint64_t len);
int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
bool miss, bool wp, bool minor, uint64_t *ioctls);
+unsigned long get_free_hugepages(void);
/*
* On ppc64 this will only work with radix 2M hugepage size
_
Patches currently in -mm which might be from leitao@xxxxxxxxxx are
selftests-mm-export-get_free_hugepages.patch
selftests-mm-add-a-new-test-for-madv-and-hugetlb.patch
