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From: Kent Overstreet To: Tejun Heo Cc: Kemeng Shi , akpm@linux-foundation.org, willy@infradead.org, jack@suse.cz, bfoster@redhat.com, dsterba@suse.com, mjguzik@gmail.com, dhowells@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH v2 0/6] Improve visibility of writeback Message-ID: <4vih3tufuhksf5pi5ydaqfynwlq42sdydmdaqzytfmxqgwi6ao@qog7ho2kvz66> References: <20240327155751.3536-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: F0BCB120002 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: a48rg9rqoro7fumx5kxhpdtge71cue7o X-HE-Tag: 1711659219-595944 X-HE-Meta: U2FsdGVkX18pym+ofKBxP8Ft++OzATYWurDJPyig98CCzvU0qkYRIYKppztLyJ2BtJTjft2wJcJ96rPMTP92NOo2nVXSg2S9nhBjzVDUYNwxvO+62kX/qzAhTRswU6ORxgyrmRhiMYJWepK6Gnyrk3TLcqBojdB4DPcDCmglrmkFDCoWRrQx2mikVggvli8ky8gPWGCbMJ/AmojYwc2zu7u7//V4FLOHJTFDNjCTEpIMawKFT6naUQpB22Hm1O4lcNCc9bicMnBjxcPvNGsIy+q3kHrLl/iZYty2gCLh0ZezYryXmw3FgmZQRZWJucZQlqHKIl9Dftq1KN5AhEwsHpgkbXUVU5SnFYzCznEmMXizkiGXLlo1vIyZNLWghb04pVKIgE0+egYBq50KG8pTTYxqTcYwxF5yhHbS2+5HHMK8Vd16A3rUnAtltLUgLELwtp7o85tyEHpfFkUzxG0LpZknktSnKrLPCo3qJiIZx00kwqx1w2GunVqllOWpbgFxLcJ7lVuoa71t0sqKJVtGWuhS8MvXSd3QreAUsk3eTCJz1HrzkgPuCHjO/x5mg50f+7T0/UXwUZrCYNp3l/0fZ0CEcSn43CMFp70p48NYAUDm8jNC/pku936mqDboXS1AR4oTuSxc/DImGjIeC+enHQY0pBHzfhGTgfZUW5nC2igAt//9n2+Yqp8dMbS8PnMcKQnu5tr0xjwdets5i2NOrtcrZGyvLuttxEBj5ll4S36OL7dvFb6GQ7KMWx9ZKu9q+ku+EZ2n9fXf9XYtFsaAZFBRcsXXvlPePsi070LpwVC+Z+hZnXiT8V1UlprwJhZfq7qIoVsaUzZZCEE0InAIpwALRffzk5AWZce4NQY70O0Com0nN/LRUYZ0AHmHvbsDxbpoFojoKyDz5rPeak9MnLYSlsQP/ftwqRm7y7/2bS+CZzBWpqaDi+LOQjZaYiE5Q6yn+8pVmTgX0zzR84Q 5aVnHYN2 0a35ipfc41vsuLZvCkkbkU39pqUlpraiChGPJLfy7akih13d6GZERujUdILwgx9UWtKS6esAQNF+ItX7B+yrN1KDzog== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Mar 28, 2024 at 10:46:33AM -1000, Tejun Heo wrote: > Hello, Kent. > > On Thu, Mar 28, 2024 at 04:22:13PM -0400, Kent Overstreet wrote: > > Most users are never going to touch tracing, let alone BPF; that's too > > much setup. But I can and do regularly tell users "check this, this and > > this" and debug things on that basis without ever touching their > > machine. > > I think this is where the disconnect is. It's not difficult to set up at > all. Nowadays, in most distros, it comes down to something like run "pacman > -S bcc" and then run "/usr/share/bcc/tools/biolatpcts" with these params or > run this script I'm attaching. It is a signficant boost when debugging many > different kernel issues. I strongly suggest giving it a try and getting used > to it rather than resisting it. The disconnect is with you, Tejun. I use tracing all the time, and it's not going to be much of a discussion if you're not going to formulate a response.