From patchwork Sun Nov 6 14:03:55 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Harry (Hyeonggon) Yoo" <42.hyeyoo@gmail.com> X-Patchwork-Id: 13033413 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C345C433FE for ; Sun, 6 Nov 2022 14:05:58 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D2ACB8E0007; Sun, 6 Nov 2022 09:05:57 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id CB5698E0001; Sun, 6 Nov 2022 09:05:57 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B552C8E0007; Sun, 6 Nov 2022 09:05:57 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 9F36A8E0001 for ; Sun, 6 Nov 2022 09:05:57 -0500 (EST) Received: from smtpin18.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 71AE940C28 for ; Sun, 6 Nov 2022 14:05:57 +0000 (UTC) X-FDA: 80103191154.18.046D170 Received: from mail-pl1-f179.google.com (mail-pl1-f179.google.com [209.85.214.179]) by imf17.hostedemail.com (Postfix) with ESMTP id 14FA940002 for ; Sun, 6 Nov 2022 14:05:56 +0000 (UTC) Received: by mail-pl1-f179.google.com with SMTP id p12so3410496plq.4 for ; Sun, 06 Nov 2022 06:05:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=smCLlLyTQyDwgc2ypyGBDtflgmLDspTngdUNottfTWg=; b=mc6yIRmuumqY0HGaWV/CJrfs3m3/Eiu6jlpSdE3xAB1eptE8MGjjeNCnMwrmPecCwn siWV69WENJ7VgEVkCtFq7MZBq0YmLCJ+Xx4IYokNr+UznTb4tIOxrIjKn9C5gM76GVtU 3d1TP+IFqemIK4rJCAub6sTMoQC8ugbnc9MzLluN1FdaOd0/HfsAsjyAwAvvGRcJ5321 6wE64QZq8LxIZVwFXtNT3HEADjK92f/vVNXheffQaAk1lBaO0z/vy/W4lAYK9C5gAiDA 9JXJ7mvRQN66VKYcttbu1jTZGvWGl/fQW9sVXzJBMG8RykgM5cNdNcRogyhkXxFYa5Jr hfKA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=smCLlLyTQyDwgc2ypyGBDtflgmLDspTngdUNottfTWg=; b=rwQd8lFWvA6mVwAKBxME7iNs1HuTAEhD5MjrImTfFFQYq/0mBiDd+ZvcBCeQ+ggqHp h05P7k7kqWXhjn0Mdyu1DBrl8ceGoK71p3I6R2pB+Dlx5hlbuZMeXVjRiylw+au9t04N PwM+7gebxxu2gesXd5dDrdjJ/AMEvX0gUpXFFLsWeyOCF3ZaTAdsEnHWAaObo9mPgwpZ a2FFunf99LtD8d7YuNewOOAlvTFgj3FABnGqIP1IUwf1zfqb7fs/IYzfEuOwuRdSMQM9 983DYuh7bFggrbRpf4zbjJGBpYOUJzSelFbyRGneV05fIOjT1J+hgwJNbNV2cpGy1Ujz n5Aw== X-Gm-Message-State: ACrzQf0fDxobR2o26sUCmH2dEtFbqBIRdBoiaKNnfrzxaJvLtIgt11if 1/uaryUC4lJt24h8tWAlMqEfVWR0hDzbIg== X-Google-Smtp-Source: AMsMyM7bpSnjkSlkuBLbex0k3sLCvvB6FqOdB99adAtFtItsRq1queNxOE9FQUp4MstN2Z7PA3hheA== X-Received: by 2002:a17:90a:f306:b0:213:b191:f3bf with SMTP id ca6-20020a17090af30600b00213b191f3bfmr44387333pjb.237.1667743555703; Sun, 06 Nov 2022 06:05:55 -0800 (PST) Received: from hyeyoo.. ([114.29.91.56]) by smtp.gmail.com with ESMTPSA id d14-20020a170902654e00b00172f6726d8esm3156197pln.277.2022.11.06.06.05.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 06 Nov 2022 06:05:54 -0800 (PST) From: Hyeonggon Yoo <42.hyeyoo@gmail.com> To: linux-mm@kvack.org Cc: Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Vlastimil Babka , Naoya Horiguchi , Miaohe Lin , Matthew Wilcox , Minchan Kim , Mel Gorman , Andrea Arcangeli , Dan Williams , Hugh Dickins , Muchun Song , David Hildenbrand , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Petr Mladek , Steven Rostedt , Sergey Senozhatsky , Andy Shevchenko , Rasmus Villemoes , Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC v2 3/3] mm, printk: introduce new format %pGt for page_type Date: Sun, 6 Nov 2022 23:03:55 +0900 Message-Id: <20221106140355.294845-4-42.hyeyoo@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20221106140355.294845-1-42.hyeyoo@gmail.com> References: <20221106140355.294845-1-42.hyeyoo@gmail.com> MIME-Version: 1.0 ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=mc6yIRmu; spf=pass (imf17.hostedemail.com: domain of 42.hyeyoo@gmail.com designates 209.85.214.179 as permitted sender) smtp.mailfrom=42.hyeyoo@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1667743557; a=rsa-sha256; cv=none; b=7t0kT3IlojJHPIOqoPb6UmiKmkGvXrd/S9+Y/KjR3nEI6lJk9LeNCjevQwjfWJhMWS82Vk b64HhUY4EpOw8DsZYXou5oTevLoRAQOrAx5s7L2KVqRqZEgUKLHNWAbdQcDMPKH5IYxsQH ZrBmWtWVKYx2Sd2C56JtMpj+hdsxa0E= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1667743557; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=smCLlLyTQyDwgc2ypyGBDtflgmLDspTngdUNottfTWg=; b=WZp3WQKLBSCG+MRD9ltAEEDIKFGHrwqzImUBoIVwjkVMKdpzRPQ2cMdZOwXKs75op7C/1V 5mWMEQd0wqGzsQqdyYjZIkEBP2Q6ubXD82/ozYsXMhFhXMGguCLCfwX0Iui7zvxKNzp21T o8tshRZxTE0ieLTUExAyvQbUeh8w+aY= X-Stat-Signature: u7kbi15n5bax5x9q9zs6g94qwocgf8en X-Rspamd-Queue-Id: 14FA940002 Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=mc6yIRmu; spf=pass (imf17.hostedemail.com: domain of 42.hyeyoo@gmail.com designates 209.85.214.179 as permitted sender) smtp.mailfrom=42.hyeyoo@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1667743556-352251 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: dump_page() uses %pGp format to print 'flags' field of struct page. As some page flags (e.g. PG_buddy, see page-flags.h for more details) are set in page_type field, introduce %pGt format which provides human readable output of page_type. And use it in dump_page(). Note that the sense of bits are different in page_type. if page_type is 0xffffffff, no flags are set. if PG_slab (0x00100000) flag is set, page_type is 0xffefffff. Clearing a bit means we set the bit. Bits in page_type are inverted when printing type names. Below is examples of dump_page(). One is just after alloc_pages() and the other is after __SetPageSlab(). [ 1.814728] page:ffffea000415e200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105788 [ 1.815961] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff) [ 1.816443] page_type: 0xffffffff() [ 1.816704] raw: 0017ffffc0000000 0000000000000000 dead000000000122 0000000000000000 [ 1.817291] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 [ 1.817870] page dumped because: Before __SetPageSlab() [ 1.818258] page:ffffea000415e200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105788 [ 1.818857] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff) [ 1.819250] page_type: 0xffefffff(slab) [ 1.819483] raw: 0017ffffc0000000 0000000000000000 dead000000000122 0000000000000000 [ 1.819947] raw: 0000000000000000 0000000000000000 00000001ffefffff 0000000000000000 [ 1.820410] page dumped because: After __SetPageSlab() Cc: Petr Mladek Cc: Steven Rostedt Cc: Sergey Senozhatsky Cc: Andy Shevchenko Cc: Rasmus Villemoes Cc: Jonathan Corbet Cc: Andrew Morton Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> --- Documentation/core-api/printk-formats.rst | 3 ++- lib/test_printf.c | 23 ++++++++++++++++++++++ lib/vsprintf.c | 24 +++++++++++++++++++++++ mm/debug.c | 7 +++++++ mm/internal.h | 1 + 5 files changed, 57 insertions(+), 1 deletion(-) diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst index dbe1aacc79d0..582e965508eb 100644 --- a/Documentation/core-api/printk-formats.rst +++ b/Documentation/core-api/printk-formats.rst @@ -575,12 +575,13 @@ The field width is passed by value, the bitmap is passed by reference. Helper macros cpumask_pr_args() and nodemask_pr_args() are available to ease printing cpumask and nodemask. -Flags bitfields such as page flags, gfp_flags +Flags bitfields such as page flags, page_type, gfp_flags --------------------------------------------- :: %pGp 0x17ffffc0002036(referenced|uptodate|lru|active|private|node=0|zone=2|lastcpupid=0x1fffff) + %pGt 0xffefffff(slab) %pGg GFP_USER|GFP_DMA32|GFP_NOWARN %pGv read|exec|mayread|maywrite|mayexec|denywrite diff --git a/lib/test_printf.c b/lib/test_printf.c index fe13de1bed5f..6b778a8ea44c 100644 --- a/lib/test_printf.c +++ b/lib/test_printf.c @@ -654,12 +654,26 @@ page_flags_test(int section, int node, int zone, int last_cpupid, test(cmp_buf, "%pGp", &flags); } +static void __init page_type_test(unsigned int page_type, const char *name, + char *cmp_buf) +{ + unsigned long size; + + size = scnprintf(cmp_buf, BUF_SIZE, "%#x(", page_type); + if (page_type_has_type(page_type)) + size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name); + + snprintf(cmp_buf + size, BUF_SIZE - size, ")"); + test(cmp_buf, "%pGt", &page_type); +} + static void __init flags(void) { unsigned long flags; char *cmp_buffer; gfp_t gfp; + unsigned int page_type; cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL); if (!cmp_buffer) @@ -699,6 +713,15 @@ flags(void) gfp |= __GFP_HIGH; test(cmp_buffer, "%pGg", &gfp); + page_type = ~0; + page_type_test(page_type, "", cmp_buffer); + + page_type = ~PG_slab; + page_type_test(page_type, "slab", cmp_buffer); + + page_type = ~(PG_slab | PG_table | PG_buddy); + page_type_test(page_type, "slab|table|buddy", cmp_buffer); + kfree(cmp_buffer); } diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 24f37bab8bc1..d855b40e5cfd 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -2056,6 +2056,28 @@ char *format_page_flags(char *buf, char *end, unsigned long flags) return buf; } +static +char *format_page_type(char *buf, char *end, unsigned int page_type) +{ + if (!(page_type & PAGE_TYPE_BASE)) + return string(buf, end, "no type for user-mapped page", default_str_spec); + + buf = number(buf, end, page_type, default_flag_spec); + + if (buf < end) + *buf = '('; + buf++; + + if (page_type_has_type(page_type)) + buf = format_flags(buf, end, ~page_type, pagetype_names); + + if (buf < end) + *buf = ')'; + buf++; + + return buf; +} + static noinline_for_stack char *flags_string(char *buf, char *end, void *flags_ptr, struct printf_spec spec, const char *fmt) @@ -2069,6 +2091,8 @@ char *flags_string(char *buf, char *end, void *flags_ptr, switch (fmt[1]) { case 'p': return format_page_flags(buf, end, *(unsigned long *)flags_ptr); + case 't': + return format_page_type(buf, end, *(unsigned int *)flags_ptr); case 'v': flags = *(unsigned long *)flags_ptr; names = vmaflag_names; diff --git a/mm/debug.c b/mm/debug.c index 0fd15ba70d16..bb7f2278abc5 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -36,6 +36,11 @@ const struct trace_print_flags pageflag_names[] = { {0, NULL} }; +const struct trace_print_flags pagetype_names[] = { + __def_pagetype_names, + {0, NULL} +}; + const struct trace_print_flags gfpflag_names[] = { __def_gfpflag_names, {0, NULL} @@ -114,6 +119,8 @@ static void __dump_page(struct page *page) pr_warn("%sflags: %pGp%s\n", type, &head->flags, page_cma ? " CMA" : ""); + pr_warn("page_type: %pGt\n", &head->page_type); + print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32, sizeof(unsigned long), page, sizeof(struct page), false); diff --git a/mm/internal.h b/mm/internal.h index cb4c663a714e..956eaa9f12c0 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -773,6 +773,7 @@ static inline void flush_tlb_batched_pending(struct mm_struct *mm) #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */ extern const struct trace_print_flags pageflag_names[]; +extern const struct trace_print_flags pagetype_names[]; extern const struct trace_print_flags vmaflag_names[]; extern const struct trace_print_flags gfpflag_names[];