From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1522438384; cv=none; d=google.com; s=arc-20160816; b=xk4+1LITHlQxCkRGfheGyHqwbFbwjCb9aY0DmMKt4ys/WTomDzs/9eKe/9hIVzw5PP u27+BZzPOvfi+LrbClOJmoOct/276K/asZe9L7Pm7y2HbdavbPav7Ok/TeyARz5cpg9W Lpicmt/Hc2s7IcnXrh8za76coRoR2285JPbUgzf48Z/YaENBp3k5HSdRe1Y+pmCI9Q0y VFD1wHKQokcU9Ys95RBpfTGY8nKh9EJQN12y3vHxKpiOJ81CK9omopoaCT1dBAR5pV6L c38SqOakH3X/LezyQ2Ir8STtEa2vXSyWabbhTn0HGRPrHHNQ6qEVkl5gSME9kgqGa8UW oqXA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=message-id:date:subject:cc:to:from:dkim-signature :arc-authentication-results; bh=JA4QwysT65TL3p4+ugmPWGXMv3XAzR4LYvjH/UZkpEg=; b=U8oUWLFYFK814EzfwHV/U6pJeX27fYVWGa3Losro9p3LUB449P0v4Etvj0vSt2+qpQ nLrQPOC69ZzkPFfnnmq1xAmAeyz0Vowr0i+X8lFSxmB9NqxTUdyOkUr+ad77ghPeI9xc yPo1eJ2VI+yW7LSh4Kh90TVTYywutrxHYMlGWSlI+t/YEssjXJ0usEYIoDhxqMDzSWrt CbClddF+m9/fja0wPv0TAyE5EVvtCae2/7ZdYxquudsVq6TAgOS09SW4DfNxm8e6aZ4Q INMx1JGbqOiVtMftsWKwVm4wwP8gcyqKHtBktxgH3KEFKF7LfvuPrUHXIFmILLLl60EI AOEg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=YdFmk8WL; spf=pass (google.com: domain of souvik1997@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=souvik1997@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=YdFmk8WL; spf=pass (google.com: domain of souvik1997@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=souvik1997@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com X-Google-Smtp-Source: AIpwx49KZ7iI3PeHtvRAsDI7YCcsKh+nt/n00zGParnppSleFr+eg5WLhsHIz+eiTiU/2lfJA3msMA== From: Souvik Banerjee To: Jens Axboe Cc: souvik1997@gmail.com, Eric Biggers , "Steven Rostedt (VMware)" , Philippe Ombredanne , Kate Stewart , Greg Kroah-Hartman , Shaohua Li , linux-kernel@vger.kernel.org Subject: [PATCH] blktrace: fix comment in blktrace_api.h Date: Fri, 30 Mar 2018 14:32:42 -0500 Message-Id: <20180330193243.26044-1-souvik1997@gmail.com> X-Mailer: git-send-email 2.16.3 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1596392351859701170?= X-GMAIL-MSGID: =?utf-8?q?1596392351859701170?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: The `__u64 time` field of the blk_io_trace struct refers to the time in nanoseconds, not in microseconds. It is set in __blk_add_trace, which does the following: t->time = ktime_to_ns(ktime_get()); ktime_to_ns returns ktime_t in nanoseconds, not microseconds. Signed-off-by: Souvik Banerjee --- include/uapi/linux/blktrace_api.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/uapi/linux/blktrace_api.h b/include/uapi/linux/blktrace_api.h index 3c50e07ee833..690621b610e5 100644 --- a/include/uapi/linux/blktrace_api.h +++ b/include/uapi/linux/blktrace_api.h @@ -101,7 +101,7 @@ enum blktrace_notify { struct blk_io_trace { __u32 magic; /* MAGIC << 8 | version */ __u32 sequence; /* event number */ - __u64 time; /* in microseconds */ + __u64 time; /* in nanoseconds */ __u64 sector; /* disk offset */ __u32 bytes; /* transfer length */ __u32 action; /* what happened */ -- 2.16.3