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To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , arnd@arndb.de, tglx@linutronix.de, vincenzo.frascino@arm.com, luto@kernel.org Date: Mon, 23 Dec 2019 14:31:01 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191223_063112_161879_FB1F7B6B X-CRM114-Status: GOOD ( 10.84 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is a second tentative to switch powerpc/32 vdso to generic C implementation. It will likely not work on 64 bits or even build properly at the moment. powerpc is a bit special for VDSO as well as system calls in the way that it requires setting CR SO bit which cannot be done in C. Therefore, entry/exit and fallback needs to be performed in ASM. To allow that, the fallback calls are moved out of the common code and left to the arches. A few other changes in the common code have allowed performance improvement. The performance has improved since first RFC, but it is still lower than current assembly VDSO. On a powerpc8xx, with current powerpc/32 ASM VDSO: gettimeofday: vdso: 737 nsec/call clock-getres-realtime: vdso: 475 nsec/call clock-gettime-realtime: vdso: 892 nsec/call clock-getres-monotonic: vdso: 475 nsec/call clock-gettime-monotonic: vdso: 1014 nsec/call First try of C implementation: gettimeofday: vdso: 1533 nsec/call clock-getres-realtime: vdso: 853 nsec/call clock-gettime-realtime: vdso: 1570 nsec/call clock-getres-monotonic: vdso: 835 nsec/call clock-gettime-monotonic: vdso: 1605 nsec/call With this series: gettimeofday: vdso: 1016 nsec/call clock-getres-realtime: vdso: 560 nsec/call clock-gettime-realtime: vdso: 1192 nsec/call clock-getres-monotonic: vdso: 560 nsec/call clock-gettime-monotonic: vdso: 1192 nsec/call Changes made to other arches are untested, not even compiled. Christophe Leroy (10): lib: vdso: ensure all arches have 32bit fallback lib: vdso: move call to fallback out of common code. lib: vdso: Change __cvdso_clock_gettime/getres_common() to __cvdso_clock_gettime/getres() lib: vdso: get pointer to vdso data from the arch lib: vdso: inline do_hres() lib: vdso: make do_coarse() return 0 lib: vdso: don't use READ_ONCE() in __c_kernel_time() lib: vdso: Avoid duplication in __cvdso_clock_getres() powerpc/vdso32: inline __get_datapage() powerpc/32: Switch VDSO to C implementation. arch/arm/include/asm/vdso/gettimeofday.h | 26 +++ arch/arm/vdso/vgettimeofday.c | 32 ++- arch/arm64/include/asm/vdso/compat_gettimeofday.h | 2 - arch/arm64/include/asm/vdso/gettimeofday.h | 26 +++ arch/arm64/kernel/vdso/vgettimeofday.c | 24 +- arch/arm64/kernel/vdso32/vgettimeofday.c | 39 +++- arch/mips/include/asm/vdso/gettimeofday.h | 28 ++- arch/mips/vdso/vgettimeofday.c | 56 ++++- arch/powerpc/Kconfig | 2 + arch/powerpc/include/asm/vdso/gettimeofday.h | 45 ++++ arch/powerpc/include/asm/vdso/vsyscall.h | 27 +++ arch/powerpc/include/asm/vdso_datapage.h | 28 +-- arch/powerpc/kernel/asm-offsets.c | 23 +- arch/powerpc/kernel/time.c | 92 +------- arch/powerpc/kernel/vdso.c | 19 +- arch/powerpc/kernel/vdso32/Makefile | 19 +- arch/powerpc/kernel/vdso32/cacheflush.S | 9 +- arch/powerpc/kernel/vdso32/datapage.S | 28 +-- arch/powerpc/kernel/vdso32/gettimeofday.S | 265 +++------------------- arch/powerpc/kernel/vdso32/vgettimeofday.c | 32 +++ arch/x86/entry/vdso/vclock_gettime.c | 52 ++++- arch/x86/include/asm/vdso/gettimeofday.h | 28 ++- lib/vdso/gettimeofday.c | 100 +++----- 23 files changed, 505 insertions(+), 497 deletions(-) create mode 100644 arch/powerpc/include/asm/vdso/gettimeofday.h create mode 100644 arch/powerpc/include/asm/vdso/vsyscall.h create mode 100644 arch/powerpc/kernel/vdso32/vgettimeofday.c -- 2.13.3 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel