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Date: Sun, 2 Nov 2014 14:58:07 +0100 From: Wolfram Sang <wsa@...-dreams.de> To: linux-kernel@...r.kernel.org Cc: linux-i2c@...r.kernel.org, linux-spi@...r.kernel.org, Mark Brown <broonie@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Balbir Singh <bsingharora@...il.com>, Wolfram Sang <wsa@...-dreams.de> Subject: [RFC 0/2] drivers: spi/i2c: account completions as iowait So, I recently learned that there is wait_for_completion_io_* because one I2C driver uses it instead of wait_for_completion_*. I want consistency, so technically the io-versions seem to be the correct ones to me, because, well, we are waiting for IO. However, researching the net, users currently interpret iowait entirely as blkio wait. Furthermore, io_schedule() calls delayacct_blkio_{start|end}() which worked fine for my tests with I2C but might show that iowait was really meant as blkiowait? So, should other subsystems use it? To make it more confusing, some people (like Peter Zijlstra [1]) seem to like iowait gone, so maybe it is all not worth it? I'd be grateful for a rule-of-thumb here. And because people like to discuss code, I created patches to convert I2C and SPI to be accounted as iowait ;) Thanks, Wolfram [1] http://www.spinics.net/lists/kernel/msg1778892.html Wolfram Sang (2): i2c: account completions as iowait spi: account completions as iowait drivers/i2c/busses/i2c-axxia.c | 4 ++-- drivers/i2c/busses/i2c-bcm-kona.c | 8 ++++---- drivers/i2c/busses/i2c-bcm2835.c | 2 +- drivers/i2c/busses/i2c-bfin-twi.c | 4 ++-- drivers/i2c/busses/i2c-cadence.c | 2 +- drivers/i2c/busses/i2c-davinci.c | 2 +- drivers/i2c/busses/i2c-designware-core.c | 2 +- drivers/i2c/busses/i2c-efm32.c | 2 +- drivers/i2c/busses/i2c-exynos5.c | 2 +- drivers/i2c/busses/i2c-highlander.c | 2 +- drivers/i2c/busses/i2c-hix5hd2.c | 2 +- drivers/i2c/busses/i2c-ismt.c | 2 +- drivers/i2c/busses/i2c-mxs.c | 2 +- drivers/i2c/busses/i2c-nomadik.c | 4 ++-- drivers/i2c/busses/i2c-omap.c | 2 +- drivers/i2c/busses/i2c-pmcmsp.c | 2 +- drivers/i2c/busses/i2c-pnx.c | 2 +- drivers/i2c/busses/i2c-qup.c | 4 ++-- drivers/i2c/busses/i2c-riic.c | 2 +- drivers/i2c/busses/i2c-sh7760.c | 2 +- drivers/i2c/busses/i2c-sirf.c | 2 +- drivers/i2c/busses/i2c-st.c | 2 +- drivers/i2c/busses/i2c-sun6i-p2wi.c | 2 +- drivers/i2c/busses/i2c-tegra.c | 2 +- drivers/i2c/busses/i2c-wmt.c | 4 ++-- drivers/spi/spi-altera.c | 2 +- drivers/spi/spi-atmel.c | 2 +- drivers/spi/spi-au1550.c | 4 ++-- drivers/spi/spi-bcm2835.c | 2 +- drivers/spi/spi-bcm63xx-hsspi.c | 2 +- drivers/spi/spi-bcm63xx.c | 2 +- drivers/spi/spi-efm32.c | 2 +- drivers/spi/spi-ep93xx.c | 4 ++-- drivers/spi/spi-fsl-espi.c | 2 +- drivers/spi/spi-fsl-spi.c | 2 +- drivers/spi/spi-imx.c | 6 +++--- drivers/spi/spi-mpc512x-psc.c | 2 +- drivers/spi/spi-mpc52xx-psc.c | 2 +- drivers/spi/spi-mxs.c | 2 +- drivers/spi/spi-nuc900.c | 2 +- drivers/spi/spi-oc-tiny.c | 2 +- drivers/spi/spi-omap2-mcspi.c | 4 ++-- drivers/spi/spi-ppc4xx.c | 2 +- drivers/spi/spi-qup.c | 2 +- drivers/spi/spi-s3c24xx.c | 2 +- drivers/spi/spi-s3c64xx.c | 2 +- drivers/spi/spi-sh-msiof.c | 4 ++-- drivers/spi/spi-sirf.c | 10 +++++----- drivers/spi/spi-sun4i.c | 2 +- drivers/spi/spi-sun6i.c | 2 +- drivers/spi/spi-tegra114.c | 2 +- drivers/spi/spi-tegra20-sflash.c | 2 +- drivers/spi/spi-tegra20-slink.c | 2 +- drivers/spi/spi-ti-qspi.c | 4 ++-- drivers/spi/spi-xilinx.c | 2 +- drivers/spi/spi.c | 4 ++-- drivers/spi/spidev.c | 2 +- 57 files changed, 77 insertions(+), 77 deletions(-) -- 2.1.1 -- 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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