linux-kernel - specjbb2005 fails with 2.6.29-rc4

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Message-Id: <1234401390.7699.29.camel@minggr.sh.intel.com>
Date:	Thu, 12 Feb 2009 09:16:30 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	torvalds@...ux-foundation.org
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: specjbb2005 fails with 2.6.29-rc4

specjbb2005 fails with 2.6.29-rc4 in many testing machines.

On a 4*4cores Tigerton machine, run specjb2005 with
starting_number_warehouses = 1 and ending_number_warehouses = 34.
It fails when warehouses=16.

Test with Jrockit VM fails. And it works well if OpenJDK is used
instead.

commit fc8744adc870a8d4366908221508bb113d8b72ee
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Sat Jan 31 15:08:56 2009 -0800

    Stop playing silly games with the VM_ACCOUNT flag
    
    The mmap_region() code would temporarily set the VM_ACCOUNT flag for
    anonymous shared mappings just to inform shmem_zero_setup() that it
    should enable accounting for the resulting shm object.  It would then
    clear the flag after calling ->mmap (for the /dev/zero case) or doing
    shmem_zero_setup() (for the MAP_ANON case).
    
    This just resulted in vma merge issues, but also made for just
    unnecessary confusion.  Use the already-existing VM_NORESERVE flag for
    this instead, and let shmem_{zero|file}_setup() just figure it out from
    that.
    
    This also happens to make it obvious that the new DRI2 GEM layer uses a
    non-reserving backing store for its object allocation - which is quite
    possibly not intentional.  But since I didn't want to change semantics
    in this patch, I left it alone, and just updated the caller to use the
    new flag semantics.
    
    Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
---
 drivers/gpu/drm/drm_gem.c |    2 +-
 ipc/shm.c                 |    4 +-
 mm/mmap.c                 |   48 +++++++++++++++++++++++---------------------
 mm/shmem.c                |    2 +-
 4 files changed, 29 insertions(+), 27 deletions(-)


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