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Commit 0fad336b authored by Chiawei Wang's avatar Chiawei Wang Committed by Mark Salyzyn
Browse files

ANDROID: arch: arm64: vdso: export the symbols for time() 



__cvdso_time() can be found in vDSO implementation,
but the symbols for time() are not exported.

Export the symbols and run bionic-benchmarks.

BEFORE:
bionic-benchmarks32 --bionic_extra BM_time_time
-----------------------------------------------------
Benchmark           Time             CPU   Iterations
-----------------------------------------------------
BM_time_time     83.6 ns         83.5 ns      8385964

bionic-benchmarks64 --bionic_extra BM_time_time
-----------------------------------------------------
Benchmark           Time             CPU   Iterations
-----------------------------------------------------
BM_time_time     63.5 ns         63.4 ns     11037509

AFTER:
bionic-benchmarks32 --bionic_extra BM_time_time
-----------------------------------------------------
Benchmark           Time             CPU   Iterations
-----------------------------------------------------
BM_time_time     8.57 ns         8.56 ns     81887312

bionic-benchmarks64 --bionic_extra BM_time_time
-----------------------------------------------------
Benchmark           Time             CPU   Iterations
-----------------------------------------------------
BM_time_time     7.52 ns         7.51 ns     93253809

Signed-off-by: default avatarChiawei Wang <chiaweiwang@google.com>
Bug: 154668398
Bug: 157925983
Test: run bionic-benchmarks --bionic_xml vdso.xml
(cherry picked from fc30ad8ca60eccbce5245103fb4a2b070aa294de)
Signed-off-by: default avatarMark Salyzyn <salyzyn@google.com>
Change-Id: Ibd9835254c065801ba2f0976dffbf70d7bf0c85c
parent 21cb61c2

arch/arm64/include/asm/vdso/compat_gettimeofday.h

+2 −0
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 


#define VDSO_HAS_CLOCK_GETRES		1



#define VDSO_HAS_TIME			1



#define BUILD_VDSO32			1



static __always_inline

arch/arm64/include/asm/vdso/gettimeofday.h

+2 −0
Original line number Diff line number Diff line
@@ -13,6 +13,8 @@ 


#define VDSO_HAS_CLOCK_GETRES		1



#define VDSO_HAS_TIME			1



static __always_inline

int gettimeofday_fallback(struct __kernel_old_timeval *_tv,

			  struct timezone *_tz)

arch/arm64/kernel/vdso/vdso.lds.S

+1 −0
Original line number Diff line number Diff line
@@ -88,6 +88,7 @@ VERSION 
		__kernel_gettimeofday;

		__kernel_clock_gettime;

		__kernel_clock_getres;

		__kernel_time;

	local: *;

	};

}

arch/arm64/kernel/vdso/vgettimeofday.c

+5 −0
Original line number Diff line number Diff line
@@ -23,3 +23,8 @@ int __kernel_clock_getres(clockid_t clock_id, 
{

	return __cvdso_clock_getres(clock_id, res);

}



time_t __kernel_time(time_t *time)

{

	return __cvdso_time(time);

}

arch/arm64/kernel/vdso32/vdso.lds.S

+1 −0
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ VERSION 
		__kernel_rt_sigreturn_arm;

		__kernel_rt_sigreturn_thumb;

		__vdso_clock_gettime64;

		__vdso_time;

	local: *;

	};

}