|
 |
0dfa60 |
From 8cc33a134681892a71a4f67397bb13a541bb463e Mon Sep 17 00:00:00 2001
|
|
|
0dfa60 |
Message-Id: <8cc33a134681892a71a4f67397bb13a541bb463e.1566225007.git.aquini@redhat.com>
|
|
|
0dfa60 |
In-Reply-To: <d42f467a923dfc09309acb7a83b42e3285fbd8f4.1566225007.git.aquini@redhat.com>
|
|
|
0dfa60 |
References: <d42f467a923dfc09309acb7a83b42e3285fbd8f4.1566225007.git.aquini@redhat.com>
|
|
|
0dfa60 |
From: Sandipan Das <sandipan@linux.ibm.com>
|
|
|
0dfa60 |
Date: Thu, 15 Aug 2019 13:08:38 +0530
|
|
|
0dfa60 |
Subject: [RHEL7 PATCH 11/31] hugeutils: Add utility to check if slices are
|
|
|
0dfa60 |
supported
|
|
|
0dfa60 |
|
|
|
0dfa60 |
This adds an utility to check if the current processor
|
|
|
0dfa60 |
architecture supports slices. Slices are used to divide
|
|
|
0dfa60 |
up a virtual address space and put certain restrictions
|
|
|
0dfa60 |
like on powerpc64 with Hash MMU where one can have only
|
|
|
0dfa60 |
one page size per slice.
|
|
|
0dfa60 |
|
|
|
0dfa60 |
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
|
|
|
0dfa60 |
Signed-off-by: Eric B Munson <emunson@mgebm.net>
|
|
|
0dfa60 |
Signed-off-by: Rafael Aquini <aquini@redhat.com>
|
|
|
0dfa60 |
---
|
|
|
0dfa60 |
hugeutils.c | 21 +++++++++++++++++++++
|
|
|
0dfa60 |
libhugetlbfs_privutils.h | 3 +++
|
|
|
0dfa60 |
2 files changed, 24 insertions(+)
|
|
|
0dfa60 |
|
|
|
0dfa60 |
diff --git a/hugeutils.c b/hugeutils.c
|
|
|
0dfa60 |
index fc64946..e573622 100644
|
|
|
0dfa60 |
--- a/hugeutils.c
|
|
|
0dfa60 |
+++ b/hugeutils.c
|
|
|
0dfa60 |
@@ -800,6 +800,27 @@ int hpool_sizes(struct hpage_pool *pools, int pcnt)
|
|
|
0dfa60 |
return (which < pcnt) ? which : -1;
|
|
|
0dfa60 |
}
|
|
|
0dfa60 |
|
|
|
0dfa60 |
+int arch_has_slice_support(void)
|
|
|
0dfa60 |
+{
|
|
|
0dfa60 |
+#ifdef __powerpc64__
|
|
|
0dfa60 |
+ char mmu_type[16];
|
|
|
0dfa60 |
+ FILE *fp;
|
|
|
0dfa60 |
+
|
|
|
0dfa60 |
+ fp = popen("cat /proc/cpuinfo | grep MMU | awk '{ print $3}'", "r");
|
|
|
0dfa60 |
+ if (!fp || fscanf(fp, "%s", mmu_type) < 0) {
|
|
|
0dfa60 |
+ ERROR("Failed to determine MMU type\n");
|
|
|
0dfa60 |
+ abort();
|
|
|
0dfa60 |
+ }
|
|
|
0dfa60 |
+
|
|
|
0dfa60 |
+ pclose(fp);
|
|
|
0dfa60 |
+ return strcmp(mmu_type, "Hash") == 0;
|
|
|
0dfa60 |
+#elif defined(__powerpc__) && !defined(PPC_NO_SEGMENTS)
|
|
|
0dfa60 |
+ return 1;
|
|
|
0dfa60 |
+#else
|
|
|
0dfa60 |
+ return 0;
|
|
|
0dfa60 |
+#endif
|
|
|
0dfa60 |
+}
|
|
|
0dfa60 |
+
|
|
|
0dfa60 |
/*
|
|
|
0dfa60 |
* If we have a default page size then we support hugepages.
|
|
|
0dfa60 |
*/
|
|
|
0dfa60 |
diff --git a/libhugetlbfs_privutils.h b/libhugetlbfs_privutils.h
|
|
|
0dfa60 |
index 149e42f..8b12fed 100644
|
|
|
0dfa60 |
--- a/libhugetlbfs_privutils.h
|
|
|
0dfa60 |
+++ b/libhugetlbfs_privutils.h
|
|
|
0dfa60 |
@@ -53,6 +53,9 @@ int set_nr_hugepages(long pagesize, unsigned long val);
|
|
|
0dfa60 |
#define set_nr_overcommit_hugepages __pu_set_nr_overcommit_hugepages
|
|
|
0dfa60 |
int set_nr_overcommit_hugepages(long pagesize, unsigned long val);
|
|
|
0dfa60 |
|
|
|
0dfa60 |
+#define arch_has_slice_support __pu_arch_has_slice_support
|
|
|
0dfa60 |
+int arch_has_slice_support(void);
|
|
|
0dfa60 |
+
|
|
|
0dfa60 |
#define kernel_has_hugepages __pu_kernel_has_hugepages
|
|
|
0dfa60 |
int kernel_has_hugepages(void);
|
|
|
0dfa60 |
|
|
|
0dfa60 |
--
|
|
|
0dfa60 |
1.8.3.1
|
|
|
0dfa60 |
|