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Re: [Qemu-devel] [PATCH v2 03/13] tcg: enforce 64-byte alignment of TCGC

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v2 03/13] tcg: enforce 64-byte alignment of TCGContext
Date: Tue, 25 Apr 2017 13:01:48 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0

On 04/25/2017 09:53 AM, Emilio G. Cota wrote:
This will allow us to prevent cache line false sharing in TCGContext.

$ objdump -t  build/x86_64-linux-user/qemu-x86_64 | grep tcg_ctx
00000000003ea820 g     O .bss   00000000000152d8              tcg_ctx

$ objdump -t  build/x86_64-linux-user/qemu-x86_64 | grep tcg_ctx
00000000003ea880 g     O .bss   0000000000015300              tcg_ctx

Signed-off-by: Emilio G. Cota <address@hidden>
  tcg/tcg.h | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tcg/tcg.h b/tcg/tcg.h
index 6c216bb..5fdbfe3 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -727,7 +727,7 @@ struct TCGContext {
uint16_t gen_insn_end_off[TCG_MAX_INSNS];
      target_ulong gen_insn_data[TCG_MAX_INSNS][TARGET_INSN_START_WORDS];

Let's drop the alignment and structure re-arrangement for now and focus on the task of goto_ptr.


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