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Date: Thu, 12 Feb 2009 09:28:17 +0800 From: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> To: Lin Ming <ming.m.lin@...el.com> Cc: torvalds@...ux-foundation.org, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: specjbb2005 fails with 2.6.29-rc4 On Thu, 2009-02-12 at 09:20 +0800, Lin Ming wrote: > On Thu, 2009-02-12 at 09:16 +0800, Lin Ming wrote: > > 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. One difference between Jrockit and OpenJDK is Jrokit uses huge pages. > > Bisect locates below commit. > > > > > 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(-) > > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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