From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Mike Kravetz <mike.kravetz@oracle.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
linux-s390@vger.kernel.org, sparclinux@vger.kernel.org,
linux-doc@vger.kernel.org
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
"David S . Miller" <davem@davemloft.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Jonathan Corbet <corbet@lwn.net>, Longpeng <longpeng2@huawei.com>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Randy Dunlap <rdunlap@infradead.org>,
Mina Almasry <almasrymina@google.com>,
Peter Xu <peterx@redhat.com>,
Nitesh Narayan Lal <nitesh@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [PATCH v3 3/4] hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate
Date: Wed, 22 Apr 2020 16:12:26 +0530 [thread overview]
Message-ID: <87blnj4x9p.fsf@linux.ibm.com> (raw)
In-Reply-To: <20200417185049.275845-4-mike.kravetz@oracle.com>
Mike Kravetz <mike.kravetz@oracle.com> writes:
> The routine hugetlb_add_hstate prints a warning if the hstate already
> exists. This was originally done as part of kernel command line
> parsing. If 'hugepagesz=' was specified more than once, the warning
> pr_warn("hugepagesz= specified twice, ignoring\n");
> would be printed.
>
> Some architectures want to enable all huge page sizes. They would
> call hugetlb_add_hstate for all supported sizes. However, this was
> done after command line processing and as a result hstates could have
> already been created for some sizes. To make sure no warning were
> printed, there would often be code like:
> if (!size_to_hstate(size)
> hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT)
>
> The only time we want to print the warning is as the result of command
> line processing.
Does this patch break hugepages=x command line? I haven't tested this
yet. But one of the details w.r.t. skipping that hugetlb_add_hstate is
to make sure we can configure the max_huge_pages.
>So, remove the warning from hugetlb_add_hstate and
> add it to the single arch independent routine processing "hugepagesz=".
> After this, calls to size_to_hstate() in arch specific code can be
> removed and hugetlb_add_hstate can be called without worrying about
> warning messages.
>
-aneesh
next prev parent reply other threads:[~2020-04-22 10:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-17 18:50 [PATCH v3 0/4] Clean up hugetlb boot command line processing Mike Kravetz
2020-04-17 18:50 ` [PATCH v3 1/4] hugetlbfs: add arch_hugetlb_valid_size Mike Kravetz
2020-04-17 18:50 ` [PATCH v3 2/4] hugetlbfs: move hugepagesz= parsing to arch independent code Mike Kravetz
2020-04-27 5:04 ` Sandipan Das
2020-04-27 17:25 ` Mike Kravetz
2020-04-27 19:09 ` Mike Kravetz
2020-04-27 20:18 ` Andrew Morton
2020-04-27 20:31 ` Mike Kravetz
2020-04-28 4:17 ` Sandipan Das
2020-04-17 18:50 ` [PATCH v3 3/4] hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate Mike Kravetz
2020-04-20 19:41 ` Anders Roxell
2020-04-22 10:42 ` Aneesh Kumar K.V [this message]
2020-04-22 16:56 ` Mike Kravetz
2020-04-17 18:50 ` [PATCH v3 4/4] hugetlbfs: clean up command line processing Mike Kravetz
2020-04-20 15:34 ` [PATCH v3 0/4] Clean up hugetlb boot " Qian Cai
2020-04-20 18:20 ` Mike Kravetz
2020-04-20 19:45 ` Will Deacon
2020-04-20 20:29 ` Anders Roxell
2020-04-20 21:40 ` Mike Kravetz
2020-04-20 22:53 ` Anders Roxell
2020-04-22 21:54 ` Casey Cairn
2020-04-21 6:58 ` Will Deacon
2020-04-21 14:02 ` Gerald Schaefer
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