From nobody Wed Dec 17 20:40:28 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E5233C27C40 for ; Wed, 22 Nov 2023 23:25:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344613AbjKVXZp (ORCPT ); Wed, 22 Nov 2023 18:25:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344558AbjKVXZf (ORCPT ); Wed, 22 Nov 2023 18:25:35 -0500 Received: from out-170.mta0.migadu.com (out-170.mta0.migadu.com [91.218.175.170]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6286419D for ; Wed, 22 Nov 2023 15:25:31 -0800 (PST) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1700695529; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hhFyhh1rGVdN8KU7zA1YO/xWC9r61TLiUr+vYD/9YWg=; b=BHd1Y+nn87jfgs0JPV5W9mQnj/jbSljivlaWBWB01hjhj/kWczcqBvz5Z6L0HpvjZCtsmd /dVQdVskpae/TXe1lhJkyqwhQBEja9RxyeQj/qFWuwDRlz1zUC1oNymeFeLzQPPjOqHaw5 +p/p0qYljzIyMnmljGtQZZIcQd8+3JE= From: Kent Overstreet To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Kent Overstreet Subject: [PATCH 5/7] mm: shrinker: Add shrinker_to_text() to debugfs interface Date: Wed, 22 Nov 2023 18:25:10 -0500 Message-ID: <20231122232515.177833-6-kent.overstreet@linux.dev> In-Reply-To: <20231122232515.177833-1-kent.overstreet@linux.dev> References: <20231122232515.177833-1-kent.overstreet@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Previously, we added shrinker_to_text() and hooked it up to the OOM report - now, the same report is available via debugfs. Signed-off-by: Kent Overstreet --- include/linux/shrinker.h | 1 + mm/shrinker_debug.c | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h index 497a7e8e348c..b8e57afabbcc 100644 --- a/include/linux/shrinker.h +++ b/include/linux/shrinker.h @@ -143,6 +143,7 @@ __printf(2, 3) struct shrinker *shrinker_alloc(unsigned int flags, const char *fmt, ...); void shrinker_register(struct shrinker *shrinker); void shrinker_free(struct shrinker *shrinker); +void shrinker_to_text(struct seq_buf *, struct shrinker *); void shrinkers_to_text(struct seq_buf *); =20 static inline bool shrinker_try_get(struct shrinker *shrinker) diff --git a/mm/shrinker_debug.c b/mm/shrinker_debug.c index 12ea5486a3e9..39342aa9f4ca 100644 --- a/mm/shrinker_debug.c +++ b/mm/shrinker_debug.c @@ -2,6 +2,7 @@ #include #include #include +#include #include #include #include @@ -159,6 +160,21 @@ static const struct file_operations shrinker_debugfs_s= can_fops =3D { .write =3D shrinker_debugfs_scan_write, }; =20 +static int shrinker_debugfs_report_show(struct seq_file *m, void *v) +{ + struct shrinker *shrinker =3D m->private; + char *bufp; + size_t buflen =3D seq_get_buf(m, &bufp); + struct seq_buf out; + + seq_buf_init(&out, bufp, buflen); + shrinker_to_text(&out, shrinker); + seq_commit(m, seq_buf_used(&out)); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(shrinker_debugfs_report); + int shrinker_debugfs_add(struct shrinker *shrinker) { struct dentry *entry; @@ -190,6 +206,8 @@ int shrinker_debugfs_add(struct shrinker *shrinker) &shrinker_debugfs_count_fops); debugfs_create_file("scan", 0220, entry, shrinker, &shrinker_debugfs_scan_fops); + debugfs_create_file("report", 0440, entry, shrinker, + &shrinker_debugfs_report_fops); return 0; } =20 --=20 2.42.0