bionic: allow the board to customize MALLOC_ALIGNMENT
Currently the dlmalloc allocates the memory with 8-byte alignment. According to the com.aurorasoftworks.quadrant.ui.professional benchmark data: We can get much better memory performance if we change it to be 16-byte aligned. For example, On Nexus-S: 8-byte aligned : 1378 1070 1142 1665 1765 1163 1179 1263 1404 avg: 1336.555555556 16-byte aligned: 1691 1731 1780 1691 1671 1678 1802 1758 1780 avg: 1731.333333333 gain: 29.53% That patch provides flexibity to customize the MALLOC_ALIGNMENT from the board config.The macro MALLOC_ALIGNMENT defaults to 8. To change it, please define BOARD_MALLOC_ALIGNMENT in the BoardConfig.mk: BOARD_MALLOC_ALIGNMENT := <whatever> Change-Id: I8da0376944a0bbcef1d0fc026bfb6d9125db9739 Signed-off-by: Jin Wei <wei.a.jin@intel.com> Signed-off-by: Jack Ren <jack.ren@intel.com> Signed-off-by: Beare, Bruce J <bruce.j.beare@intel.com>
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@ -459,6 +459,13 @@ ifeq ($(strip $(DEBUG_BIONIC_LIBC)),true)
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libc_common_cflags += -DDEBUG
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endif
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# To customize dlmalloc's alignment, set BOARD_MALLOC_ALIGNMENT in
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# the appropriate BoardConfig.mk file.
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#
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ifneq ($(BOARD_MALLOC_ALIGNMENT),)
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libc_common_cflags += -DMALLOC_ALIGNMENT=$(BOARD_MALLOC_ALIGNMENT)
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endif
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ifeq ($(TARGET_ARCH),arm)
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libc_common_cflags += -fstrict-aliasing
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libc_crt_target_cflags := -mthumb-interwork
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