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X-IronPort-AV: E=McAfee;i="6600,9927,10993"; a="6876802" X-IronPort-AV: E=Sophos;i="6.06,180,1705392000"; d="scan'208";a="6876802" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Feb 2024 13:19:03 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,180,1705392000"; d="scan'208";a="5913894" Received: from gtkramer-mobl1.amr.corp.intel.com (HELO [10.209.82.163]) ([10.209.82.163]) by fmviesa007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Feb 2024 13:19:02 -0800 Message-ID: Date: Fri, 23 Feb 2024 13:19:01 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 16/20] famfs: Add fault counters Content-Language: en-US To: John Groves , Dan Williams Cc: John Groves , Jonathan Corbet , Vishal Verma , Dave Jiang , Alexander Viro , Christian Brauner , Jan Kara , Matthew Wilcox , linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, john@jagalactic.com, Dave Chinner , Christoph Hellwig , dave.hansen@linux.intel.com, gregory.price@memverge.com References: <43245b463f00506016b8c39c0252faf62bd73e35.1708709155.git.john@groves.net> <05a12c0b-e3e3-4549-b02e-442e4b48a86d@intel.com> <65d8fa6736a18_2509b29410@dwillia2-mobl3.amr.corp.intel.com.notmuch> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/23/24 12:39, John Groves wrote: >> We had similar unit test regression concerns with fsdax where some >> upstream change silently broke PMD faults. The solution there was trace >> points in the fault handlers and a basic test that knows apriori that it >> *should* be triggering a certain number of huge faults: >> >> https://github.com/pmem/ndctl/blob/main/test/dax.sh#L31 > Good approach, thanks Dan! My working assumption is that we'll be able to make > that approach work in the famfs tests. So the fault counters should go away > in the next version. I do really suspect there's something more generic that should be done here. Maybe we need a generic 'huge_faults' perf event to pair up with the good ol' faults that we already have: # perf stat -e faults /bin/ls Performance counter stats for '/bin/ls': 104 faults 0.001499862 seconds time elapsed 0.001490000 seconds user 0.000000000 seconds sys