Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932615Ab0LNVbj (ORCPT ); Tue, 14 Dec 2010 16:31:39 -0500 Received: from smtp-out.google.com ([216.239.44.51]:28532 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932512Ab0LNVbe (ORCPT ); Tue, 14 Dec 2010 16:31:34 -0500 DomainKey-Signature: a=rsa-sha1; s=beta; d=google.com; c=nofws; q=dns; h=subject:to:from:cc:date:message-id:in-reply-to:references: user-agent:mime-version:content-type: content-transfer-encoding:x-system-of-record; b=CkOqqUmmVOmyC+r+9/bHNtyV0al9wvSyBDGvxJ5u2BnbQVXCbXV1LShkq9wDGjdDf 2vG4ihZLBdICsTnKsCxgg== Subject: [PATCH v3 18/22] sys-rq: Add option to soft dump To: simon.kagstrom@netinsight.net, davem@davemloft.net, nhorman@tuxdriver.com, Matt Mackall From: Mike Waychison Cc: adurbin@google.com, linux-kernel@vger.kernel.org, chavey@google.com, Greg KH , netdev@vger.kernel.org, =?utf-8?q?Am=C3=A9rico?= Wang , akpm@linux-foundation.org, linux-api@vger.kernel.org Date: Tue, 14 Dec 2010 13:30:32 -0800 Message-ID: <20101214213032.17022.76191.stgit@mike.mtv.corp.google.com> In-Reply-To: <20101214212846.17022.64836.stgit@mike.mtv.corp.google.com> References: <20101214212846.17022.64836.stgit@mike.mtv.corp.google.com> User-Agent: StGit/0.15 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-System-Of-Record: true Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2411 Lines: 76 It is very useful to provide some means to force the kernel logs to make it out via the kmsg_oops implementations on the console. Add a new option 'Y' to sysrq to allow dumping of logs to kmsg_dumper drivers. Signed-off-by: Mike Waychison --- Changelog: - v3 - Added a note to Documentation/sysrq.txt about the command. TODO: Figure out a better letter? Can we reuse 'v'? --- Documentation/sysrq.txt | 4 ++++ drivers/tty/sysrq.c | 14 +++++++++++++- 2 files changed, 17 insertions(+), 1 deletions(-) diff --git a/Documentation/sysrq.txt b/Documentation/sysrq.txt index 312e375..3c7ee87 100644 --- a/Documentation/sysrq.txt +++ b/Documentation/sysrq.txt @@ -118,6 +118,10 @@ On all - write a character to /proc/sysrq-trigger. e.g.: 'x' - Used by xmon interface on ppc/powerpc platforms. 'y' - Show global CPU Registers [SPARC-64 specific] +'y' - Trigger a 'soft' kmsg dump. Any kmsg_dump clients (mtdoops, + netoops, ramoops) will initiate a dump to their respective + backend. + 'z' - Dump the ftrace buffer diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c index c556ed9..f79f34a 100644 --- a/drivers/tty/sysrq.c +++ b/drivers/tty/sysrq.c @@ -41,6 +41,7 @@ #include #include #include +#include #include #include @@ -395,6 +396,17 @@ static struct sysrq_key_op sysrq_unrt_op = { .enable_mask = SYSRQ_ENABLE_RTNICE, }; +static void sysrq_handle_softdump(int key) +{ + kmsg_dump(KMSG_DUMP_SOFT, NULL); +} +static struct sysrq_key_op sysrq_softdump_op = { + .handler = sysrq_handle_softdump, + .help_msg = "soft-dump(Y)", + .action_msg = "Trigger a soft dump", + .enable_mask = SYSRQ_ENABLE_DUMP, +}; + /* Key Operations table and lock */ static DEFINE_SPINLOCK(sysrq_key_table_lock); @@ -451,7 +463,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = { /* x: May be registered on ppc/powerpc for xmon */ NULL, /* x */ /* y: May be registered on sparc64 for global register dump */ - NULL, /* y */ + &sysrq_softdump_op, /* y */ &sysrq_ftrace_dump_op, /* z */ }; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/