From nobody Mon Dec 1 21:30:47 2025 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 28DE22AEE4 for ; Fri, 28 Nov 2025 03:26:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764300408; cv=none; b=HfKCqvIWh/6dDfT/XsN8X4bJS9c6+yFsol5Q5DdMUKL4pe9koUGyeFUNaSSvlnFu66YYBAUZfKv7rWRn/HBZxD4IDLLjs2yRTkznNRCo84PtaEfTVZHdiB8rco7vaXDLFK83EeYrzLlEuzUu3CBehnhVCw4wjnI6iCn+5N4dOQs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764300408; c=relaxed/simple; bh=T4mSzU0CMss2zJgb1n3t5tOEqBgAR6J5GZ1bXEoMNew=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=G3lScPRiIlhyshxRr27+EnjexUhhWfrhk6cvrIpckAZJ8BEnOsSIxZpJooY/IOMYZcugPrb2RVjjoDny1mlo+FqrHXopsOZoz/Vdwg54bcaHvo1zoSWCckP5esVLz8IWpOcUEyF8CRJeJMSRHk2Zq4jJeovlaG3sraAa0m34Shw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--yhli.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=a3R46tWs; arc=none smtp.client-ip=209.85.210.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--yhli.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="a3R46tWs" Received: by mail-pf1-f202.google.com with SMTP id d2e1a72fcca58-7d24bbb9278so1007953b3a.0 for ; Thu, 27 Nov 2025 19:26:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1764300406; x=1764905206; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=bPY6J8aGE6D9kMp0fnzHzUqR5pFauYhLSeepNwWlytg=; b=a3R46tWsvu29Mdov5yqBaaP3De3on0cK1vB0gdOD6ILpGdw5Fq7BqDNeL7lyhlSgXK 1/SanCOsQ85FikBuYw3NpKrOOtok7KNNj+NDdASHobkHIaJQM1RcYkq4thKtLNZKoK/6 Urjp4h2iOEByeoLeJ+/d2XpsYAYQjoJtqDwzZtHfQrHaDuAnKKRvbb3KIHP9iEHEH4nd Dn2WslzrXT0u6wF1rrJuHQtc5HS7KseJ2PVJe1vVcMQ49xQwTxv0cun56jNOJTSLIldJ 6mPZFCcArWMOsx88XLMPcMBCIkgL8AC06FeNWqfkc89zNhbA0nfO+GfmbyM4m33PalOM Minw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764300406; x=1764905206; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=bPY6J8aGE6D9kMp0fnzHzUqR5pFauYhLSeepNwWlytg=; b=HNGqAhUhLj3OSOYjE2Bcbl/bYuEoE9Al8DuYlqqGNPmAQ6hyaFRP8xm5Wdc3wXi+kE V3tG96j0sPjiDie0YKt0sIMBpWFzSVHnDYA0D8yyJBwB6TzsCQiwi01cP3SX1F8G4SsD gExMFXAhDZMAfsT8a+0Fvo+fzlcUDl5z/Y63330Th/CF0ygnswZp5BpmC2pzqSr5dI20 PQn/ppsJvZ6LDTktApk+Wah4gYHhnMTmOJl7h+9ahMkIxDY0prRyDhGdDxfLf9jvn4e1 zCtLCpy/t0GlwQuzE1bqJ56lxHDVHAlqbS62zrQGSoeZYhQVm4DtHDMkGmsGMfdVolOP GEfg== X-Forwarded-Encrypted: i=1; AJvYcCXWQvDe3bQVp9spTDKos4LoNaQ+NEtu6vN8aa49PWHKy1bmUXqOJupP/5DmWVvhfeEK/LexZYnwnEaLmPQ=@vger.kernel.org X-Gm-Message-State: AOJu0Yz0zWy29E0OqbINrQNECEgYMd2LoPkEmslBPQ7mV9icM5b3h7bh mzpCPfXA6oH5HsPh0+w1KD9BX+BklHLiF5APg0jtbN1gQxTKJ6dQDM48W1BPNGN29/tCtHXuYA= = X-Google-Smtp-Source: AGHT+IGxBRbLNbmGL9n+2+vakJDui9W8IGhhE6rqBqDp7pBn826yD5OZcwJeoxjTNFqns6+vEB0c1zEf X-Received: from pfbmb15.prod.google.com ([2002:a05:6a00:760f:b0:7ae:a150:ac8]) (user=yhli job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:1895:b0:7b9:a3c8:8c3a with SMTP id d2e1a72fcca58-7c58beb75bfmr28179433b3a.7.1764300406497; Thu, 27 Nov 2025 19:26:46 -0800 (PST) Date: Fri, 28 Nov 2025 11:23:57 +0800 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.52.0.487.g5c8c507ade-goog Message-ID: <20251128032509.825003-1-yhli@google.com> Subject: [PATCH v2] f2fs: optimize trace_f2fs_write_checkpoint with enums From: YH Lin To: yes@google.com Cc: YH Lin , Jaegeuk Kim , Chao Yu , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This patch optimizes the tracepoint by replacing these hardcoded strings with a new enumeration f2fs_cp_phase. 1.Defines enum f2fs_cp_phase with values for each checkpoint phase. 2.Updates trace_f2fs_write_checkpoint to accept a u16 phase argument instead of a string pointer. 3.Uses __print_symbolic in TP_printk to convert the enum values back to their corresponding strings for human-readable trace output. This change reduces the storage overhead for each trace event by replacing a variable-length string with a 2-byte integer, while maintaining the same readable output in ftrace. Signed-off-by: YH Lin V2: - Relocate enum f2fs_cp_phase from include/trace/events/f2fs.h to fs/f2fs/f= 2fs.h, as requested by Chao Yu for better structure cleanup. Reviewed-by: Chao Yu --- fs/f2fs/checkpoint.c | 6 +++--- fs/f2fs/f2fs.h | 6 ++++++ include/trace/events/f2fs.h | 19 ++++++++++++++----- 3 files changed, 23 insertions(+), 8 deletions(-) diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index bbe07e3a6c75..b04f82fdd143 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -1673,7 +1673,7 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, s= truct cp_control *cpc) goto out; } =20 - trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops"); + trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, CP_PHASE_START_BLOCK_OP= S); =20 err =3D block_operations(sbi); if (err) @@ -1681,7 +1681,7 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, s= truct cp_control *cpc) =20 stat_cp_time(cpc, CP_TIME_OP_LOCK); =20 - trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops"); + trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, CP_PHASE_FINISH_BLOCK_O= PS); =20 f2fs_flush_merged_writes(sbi); =20 @@ -1747,7 +1747,7 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, s= truct cp_control *cpc) =20 /* update CP_TIME to trigger checkpoint periodically */ f2fs_update_time(sbi, CP_TIME); - trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint"); + trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, CP_PHASE_FINISH_CHECKPO= INT); out: if (cpc->reason !=3D CP_RESIZE) f2fs_up_write(&sbi->cp_global_sem); diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 6f509d88c596..a995103af735 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -313,6 +313,12 @@ struct cp_control { struct cp_stats stats; }; =20 +enum f2fs_cp_phase { + CP_PHASE_START_BLOCK_OPS, + CP_PHASE_FINISH_BLOCK_OPS, + CP_PHASE_FINISH_CHECKPOINT, +}; + /* * indicate meta/data type */ diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h index e00611ead024..df4017dcc701 100644 --- a/include/trace/events/f2fs.h +++ b/include/trace/events/f2fs.h @@ -50,6 +50,9 @@ TRACE_DEFINE_ENUM(CP_PAUSE); TRACE_DEFINE_ENUM(CP_RESIZE); TRACE_DEFINE_ENUM(EX_READ); TRACE_DEFINE_ENUM(EX_BLOCK_AGE); +TRACE_DEFINE_ENUM(CP_PHASE_START_BLOCK_OPS); +TRACE_DEFINE_ENUM(CP_PHASE_FINISH_BLOCK_OPS); +TRACE_DEFINE_ENUM(CP_PHASE_FINISH_CHECKPOINT); =20 #define show_block_type(type) \ __print_symbolic(type, \ @@ -175,6 +178,12 @@ TRACE_DEFINE_ENUM(EX_BLOCK_AGE); #define S_ALL_PERM (S_ISUID | S_ISGID | S_ISVTX | \ S_IRWXU | S_IRWXG | S_IRWXO) =20 +#define show_cp_phase(phase) \ + __print_symbolic(phase, \ + { CP_PHASE_START_BLOCK_OPS, "start block_ops" }, \ + { CP_PHASE_FINISH_BLOCK_OPS, "finish block_ops" }, \ + { CP_PHASE_FINISH_CHECKPOINT, "finish checkpoint" }) + struct f2fs_sb_info; struct f2fs_io_info; struct extent_info; @@ -1573,26 +1582,26 @@ TRACE_EVENT(f2fs_readpages, =20 TRACE_EVENT(f2fs_write_checkpoint, =20 - TP_PROTO(struct super_block *sb, int reason, const char *msg), + TP_PROTO(struct super_block *sb, int reason, u16 phase), =20 - TP_ARGS(sb, reason, msg), + TP_ARGS(sb, reason, phase), =20 TP_STRUCT__entry( __field(dev_t, dev) __field(int, reason) - __string(dest_msg, msg) + __field(u16, phase) ), =20 TP_fast_assign( __entry->dev =3D sb->s_dev; __entry->reason =3D reason; - __assign_str(dest_msg); + __entry->phase =3D phase; ), =20 TP_printk("dev =3D (%d,%d), checkpoint for %s, state =3D %s", show_dev(__entry->dev), show_cpreason(__entry->reason), - __get_str(dest_msg)) + show_cp_phase(__entry->phase)) ); =20 DECLARE_EVENT_CLASS(f2fs_discard, --=20 2.52.0.487.g5c8c507ade-goog