From: Yanan Wang <wangyanan55@huawei.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Andrew Jones <drjones@redhat.com>, <kvm@vger.kernel.org>,
<linux-kselftest@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: Ben Gardon <bgardon@google.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Peter Xu <peterx@redhat.com>, "Ingo Molnar" <mingo@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Jiri Olsa <jolsa@redhat.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Arnd Bergmann <arnd@arndb.de>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
<wanghaibin.wang@huawei.com>, <yuzenghui@huawei.com>,
Yanan Wang <wangyanan55@huawei.com>
Subject: [RFC PATCH v5 02/10] tools headers: Add a macro to get HUGETLB page sizes for mmap
Date: Tue, 23 Mar 2021 21:52:23 +0800 [thread overview]
Message-ID: <20210323135231.24948-3-wangyanan55@huawei.com> (raw)
In-Reply-To: <20210323135231.24948-1-wangyanan55@huawei.com>
We know that if a system supports multiple hugetlb page sizes,
the desired hugetlb page size can be specified in bits [26:31]
of the flag arguments. The value in these 6 bits will be the
shift of each hugetlb page size.
So add a macro to get the page size shift and then calculate the
corresponding hugetlb page size, using flag x.
Cc: Ben Gardon <bgardon@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Suggested-by: Ben Gardon <bgardon@google.com>
Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
---
include/uapi/linux/mman.h | 2 ++
tools/include/uapi/linux/mman.h | 2 ++
2 files changed, 4 insertions(+)
diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h
index f55bc680b5b0..d72df73b182d 100644
--- a/include/uapi/linux/mman.h
+++ b/include/uapi/linux/mman.h
@@ -41,4 +41,6 @@
#define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB
#define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB
+#define MAP_HUGE_PAGE_SIZE(x) (1ULL << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK))
+
#endif /* _UAPI_LINUX_MMAN_H */
diff --git a/tools/include/uapi/linux/mman.h b/tools/include/uapi/linux/mman.h
index f55bc680b5b0..d72df73b182d 100644
--- a/tools/include/uapi/linux/mman.h
+++ b/tools/include/uapi/linux/mman.h
@@ -41,4 +41,6 @@
#define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB
#define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB
+#define MAP_HUGE_PAGE_SIZE(x) (1ULL << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK))
+
#endif /* _UAPI_LINUX_MMAN_H */
--
2.19.1
next prev parent reply other threads:[~2021-03-23 13:53 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 13:52 [RFC PATCH v5 00/10] KVM: selftests: some improvement and a new test for kvm page table Yanan Wang
2021-03-23 13:52 ` [RFC PATCH v5 01/10] tools headers: sync headers of asm-generic/hugetlb_encode.h Yanan Wang
2021-03-23 13:52 ` Yanan Wang [this message]
2021-03-23 14:03 ` [RFC PATCH v5 02/10] tools headers: Add a macro to get HUGETLB page sizes for mmap Andrew Jones
2021-03-24 1:48 ` wangyanan (Y)
2021-03-23 13:52 ` [RFC PATCH v5 03/10] KVM: selftests: Use flag CLOCK_MONOTONIC_RAW for timing Yanan Wang
2021-03-23 13:52 ` [RFC PATCH v5 04/10] KVM: selftests: Print the errno besides error-string in TEST_ASSERT Yanan Wang
2021-03-23 14:04 ` Andrew Jones
2021-03-23 13:52 ` [RFC PATCH v5 05/10] KVM: selftests: Make a generic helper to get vm guest mode strings Yanan Wang
2021-03-23 13:52 ` [RFC PATCH v5 06/10] KVM: selftests: Add a helper to get system configured THP page size Yanan Wang
2021-03-23 14:07 ` Andrew Jones
2021-03-23 13:52 ` [RFC PATCH v5 07/10] KVM: selftests: Add a helper to get system default hugetlb " Yanan Wang
2021-03-23 13:52 ` [RFC PATCH v5 08/10] KVM: selftests: List all hugetlb src types specified with page sizes Yanan Wang
2021-03-23 14:12 ` Andrew Jones
2021-03-23 13:52 ` [RFC PATCH v5 09/10] KVM: selftests: Adapt vm_userspace_mem_region_add to new helpers Yanan Wang
2021-03-23 13:52 ` [RFC PATCH v5 10/10] KVM: selftests: Add a test for kvm page table code Yanan Wang
2021-03-24 2:21 ` wangyanan (Y)
2021-03-29 11:38 ` Andrew Jones
2021-03-29 13:25 ` wangyanan (Y)
2021-03-23 15:58 ` [RFC PATCH v5 00/10] KVM: selftests: some improvement and a new test for kvm page table Sean Christopherson
2021-03-24 2:13 ` wangyanan (Y)
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