From: "wangyanan (Y)" <wangyanan55@huawei.com>
To: Andrew Jones <drjones@redhat.com>
Cc: <kvm@vger.kernel.org>, <linux-kselftest@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
"Ben Gardon" <bgardon@google.com>,
Sean Christopherson <seanjc@google.com>,
"Vitaly Kuznetsov" <vkuznets@redhat.com>,
Peter Xu <peterx@redhat.com>, Marc Zyngier <maz@kernel.org>,
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>, <yezengruan@huawei.com>,
<yuzenghui@huawei.com>
Subject: Re: [RFC PATCH v4 2/9] tools headers: Add a macro to get HUGETLB page sizes for mmap
Date: Mon, 15 Mar 2021 10:06:33 +0800 [thread overview]
Message-ID: <84b12a41-a922-4a5a-8861-d2c310cdaa66@huawei.com> (raw)
In-Reply-To: <20210312111456.ukxss6uxu3frqmiu@kamzik.brq.redhat.com>
On 2021/3/12 19:14, Andrew Jones wrote:
> On Tue, Mar 02, 2021 at 08:57:44PM +0800, Yanan Wang wrote:
>> 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..8bd41128a0ee 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) (1 << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK))
> Needs to be '1ULL' to avoid shift overflow when given MAP_HUGE_16GB.
Thanks, drew. Will fix it.
> Thanks,
> drew
>
>> +
>> #endif /* _UAPI_LINUX_MMAN_H */
>> diff --git a/tools/include/uapi/linux/mman.h b/tools/include/uapi/linux/mman.h
>> index f55bc680b5b0..8bd41128a0ee 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) (1 << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK))
>> +
>> #endif /* _UAPI_LINUX_MMAN_H */
>> --
>> 2.23.0
>>
> .
next prev parent reply other threads:[~2021-03-15 2:07 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 12:57 [RFC PATCH v4 0/9] KVM: selftests: some improvement and a new test for kvm page table Yanan Wang
2021-03-02 12:57 ` [RFC PATCH v4 1/9] tools headers: sync headers of asm-generic/hugetlb_encode.h Yanan Wang
2021-03-02 12:57 ` [RFC PATCH v4 2/9] tools headers: Add a macro to get HUGETLB page sizes for mmap Yanan Wang
2021-03-12 11:14 ` Andrew Jones
2021-03-15 2:06 ` wangyanan (Y) [this message]
2021-03-02 12:57 ` [RFC PATCH v4 3/9] KVM: selftests: Use flag CLOCK_MONOTONIC_RAW for timing Yanan Wang
2021-03-12 11:17 ` Andrew Jones
2021-03-02 12:57 ` [RFC PATCH v4 4/9] KVM: selftests: Make a generic helper to get vm guest mode strings Yanan Wang
2021-03-02 12:57 ` [RFC PATCH v4 5/9] KVM: selftests: Add a helper to get system configured THP page size Yanan Wang
2021-03-12 11:31 ` Andrew Jones
2021-03-22 6:42 ` wangyanan (Y)
2021-03-02 12:57 ` [RFC PATCH v4 6/9] KVM: selftests: Add a helper to get system default hugetlb " Yanan Wang
2021-03-12 11:40 ` Andrew Jones
2021-03-22 6:45 ` wangyanan (Y)
2021-03-02 12:57 ` [RFC PATCH v4 7/9] KVM: selftests: List all hugetlb src types specified with page sizes Yanan Wang
2021-03-12 11:49 ` Andrew Jones
2021-03-22 7:22 ` wangyanan (Y)
2021-03-12 12:02 ` Andrew Jones
2021-03-22 7:23 ` wangyanan (Y)
2021-03-02 12:57 ` [RFC PATCH v4 8/9] KVM: selftests: Adapt vm_userspace_mem_region_add to new helpers Yanan Wang
2021-03-12 11:52 ` Andrew Jones
2021-03-02 12:57 ` [RFC PATCH v4 9/9] KVM: selftests: Add a test for kvm page table code Yanan Wang
2021-03-12 14:20 ` Andrew Jones
2021-03-22 11:59 ` wangyanan (Y)
2021-03-12 5:03 ` [RFC PATCH v4 0/9] KVM: selftests: some improvement and a new test for kvm page table wangyanan (Y)
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