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8007074: SIGSEGV at ParMarkBitMap::verify_clear() Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages. Reviewed-by: tschatzl, dcubed, brutisso
author stefank
date Fri, 16 Aug 2013 13:22:32 +0200
parents 980532a806a5
children de6a9e811145
line wrap: on
line source

!!
!! Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
!! DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
!!
!! This code is free software; you can redistribute it and/or modify it
!! under the terms of the GNU General Public License version 2 only, as
!! published by the Free Software Foundation.
!!
!! This code is distributed in the hope that it will be useful, but WITHOUT
!! ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
!! FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
!! version 2 for more details (a copy is included in the LICENSE file that
!! accompanied this code).
!!
!! You should have received a copy of the GNU General Public License version
!! 2 along with this work; if not, write to the Free Software Foundation,
!! Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
!!
!! Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
!! or visit www.oracle.com if you need additional information or have any
!! questions.
!!

    !! Possibilities:
    !! -- membar
    !! -- CAS (SP + BIAS, G0, G0)
    !! -- wr %g0, %asi

    .global SpinPause
    .align  32
SpinPause:
    retl
    mov %g0, %o0


 
    .globl _Copy_conjoint_jlongs_atomic
    .align 32
    .global   _Copy_conjoint_jlongs_atomic
 _Copy_conjoint_jlongs_atomic:
         cmp     %o0, %o1
         bleu    4f
         sll     %o2, 3, %o4
         ba      2f
    1:
         subcc   %o4, 8, %o4
         std     %o2, [%o1]
         add     %o0, 8, %o0
         add     %o1, 8, %o1
    2:
         bge,a   1b
         ldd     [%o0], %o2
         ba      5f
         nop
    3:
         std     %o2, [%o1+%o4]
    4:
         subcc   %o4, 8, %o4
         bge,a   3b
         ldd     [%o0+%o4], %o2
    5:      
         retl
         nop
 
 
  
    .globl _raw_thread_id
    .align 32
 _raw_thread_id:
    .register %g7, #scratch
        retl
        mov     %g7, %o0
 

    .globl _flush_reg_windows
    .align 32
 _flush_reg_windows:
        ta 0x03
        retl
        mov     %fp, %o0