From: Paul Walmsley <paul.walmsley@sifive.com>
To: Alexandre Ghiti <alex@ghiti.fr>
Cc: Hanjun Guo <guohanjun@huawei.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Catalin Marinas <catalin.marinas@arm.com>,
Palmer Dabbelt <palmer@sifive.com>,
Will Deacon <will.deacon@arm.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H . Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-riscv@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [PATCH v3 0/2] Hugetlbfs support for riscv
Date: Thu, 4 Jul 2019 04:35:23 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.21.9999.1907040429170.24872@viisi.sifive.com> (raw)
In-Reply-To: <c06441fd-0022-8fb9-36b0-2f5d956c3ed5@ghiti.fr>
On Thu, 4 Jul 2019, Alexandre Ghiti wrote:
> On 7/4/19 12:57 AM, Paul Walmsley wrote:
> > On Mon, 1 Jul 2019, Alexandre Ghiti wrote:
> >
> > > - libhugetlbfs testsuite on riscv64/2M:
> > > - brk_near_huge triggers an assert in malloc.c, does not on x86.
> > I was able to reproduce the 2MB megapages test results on rv64 QEMU. On a
> > HiFive Unleashed, though, a few more tests fail:
[ ... ]
> > - One of the heapshrink tests fails ("Heap did not shrink")
> >
> > # LD_PRELOAD="obj64/libhugetlbfs_privutils.so obj64/libhugetlbfs.so
> > tests/obj64/libheapshrink.so" HUGETLB_MORECORE_SHRINK=yes
> > HUGETLB_MORECORE=yes tests/obj64/heapshrink
> > Starting testcase "tests/obj64/heapshrink", pid 753
> > FAIL Heap did not shrink
> > #
> >
> > Some of these may be related to the top-down mmap work, but there might be
> > more work to do on actual hardware.
>
>
> I don't think this is related to top-down mmap layout, this test only
> mmaps a huge page. It might be interesting to see more verbose messages
> adding HUGETLB_VERBOSE=99 when launching the test.
Here is the HUGETLB_VERBOSE=99 output from the above heapshrink test on an
FU540:
libhugetlbfs [(none):86]: INFO: Found pagesize 2048 kB
libhugetlbfs [(none):86]: INFO: Parsed kernel version: [5] . [2] . [0] [pre-release: 6]
libhugetlbfs [(none):86]: INFO: Feature private_reservations is present in this kernel
libhugetlbfs [(none):86]: INFO: Feature noreserve_safe is present in this kernel
libhugetlbfs [(none):86]: INFO: Feature map_hugetlb is present in this kernel
libhugetlbfs [(none):86]: INFO: Kernel has MAP_PRIVATE reservations. Disabling heap prefaulting.
libhugetlbfs [(none):86]: INFO: Kernel supports MAP_HUGETLB
libhugetlbfs [(none):86]: INFO: HUGETLB_SHARE=0, sharing disabled
libhugetlbfs [(none):86]: INFO: HUGETLB_NO_RESERVE=no, reservations enabled
libhugetlbfs [(none):86]: INFO: No segments were appropriate for remapping
libhugetlbfs [(none):86]: INFO: setup_morecore(): heapaddr = 0x2aaac00000
libhugetlbfs [(none):86]: INFO: hugetlbfs_morecore(1052672) = ...
libhugetlbfs [(none):86]: INFO: heapbase = 0x2aaac00000, heaptop = 0x2aaac00000, mapsize = 0, delta=1052672
libhugetlbfs [(none):86]: INFO: Attempting to map 2097152 bytes
libhugetlbfs [(none):86]: INFO: ... = 0x2aaac00000
libhugetlbfs [(none):86]: INFO: hugetlbfs_morecore(0) = ...
libhugetlbfs [(none):86]: INFO: heapbase = 0x2aaac00000, heaptop = 0x2aaad01000, mapsize = 200000, delta=-1044480
libhugetlbfs [(none):86]: INFO: ... = 0x2aaad01000
Starting testcase "tests/obj64/heapshrink", pid 86
libhugetlbfs [(none):86]: INFO: hugetlbfs_morecore(33558528) = ...
libhugetlbfs [(none):86]: INFO: heapbase = 0x2aaac00000, heaptop = 0x2aaad01000, mapsize = 200000, delta=32514048
libhugetlbfs [(none):86]: INFO: Attempting to map 33554432 bytes
libhugetlbfs [(none):86]: INFO: ... = 0x2aaad01000
FAIL Heap did not shrink
This is with this hugepage configuration:
# /usr/local/bin/hugeadm --pool-list
Size Minimum Current Maximum Default
2097152 64 64 64 *
#
- Paul
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next prev parent reply other threads:[~2019-07-04 11:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-01 17:58 [PATCH v3 0/2] Hugetlbfs support for riscv Alexandre Ghiti
2019-07-01 17:58 ` [PATCH v3 1/2] x86, arm64: Move ARCH_WANT_HUGE_PMD_SHARE config in arch/Kconfig Alexandre Ghiti
2019-07-01 18:51 ` Paul Walmsley
2019-07-02 15:37 ` Alexandre Ghiti
2019-07-02 1:27 ` Hanjun Guo
2019-07-02 15:38 ` Alexandre Ghiti
2019-07-02 13:22 ` Christoph Hellwig
2019-07-01 17:59 ` [PATCH v3 2/2] riscv: Introduce huge page support for 32/64bit kernel Alexandre Ghiti
2019-07-02 13:24 ` Christoph Hellwig
2019-07-02 15:39 ` Alexandre Ghiti
2019-07-03 22:57 ` [PATCH v3 0/2] Hugetlbfs support for riscv Paul Walmsley
2019-07-04 6:33 ` Alexandre Ghiti
2019-07-04 11:35 ` Paul Walmsley [this message]
2019-07-07 15:14 ` Alex Ghiti
2019-07-03 23:04 ` Christoph Hellwig
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