lkml.org 
[lkml]   [2019]   [Jul]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3 0/2] Hugetlbfs support for riscv
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

\
 
 \ /
  Last update: 2019-07-04 13:35    [W:0.043 / U:10.316 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site