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Message-Id: <20100208105828.1136310a.akpm@linux-foundation.org> Date: Mon, 8 Feb 2010 10:58:28 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: tytso@....edu Cc: Jan Kara <jack@...e.cz>, Christoph Egger <siccegge@...d.informatik.uni-erlangen.de>, linux-kernel@...r.kernel.org, Kazuo Moriwaka <moriwaka@...hat.com>, H Hartley Sweeten <hsweeten@...ionengravers.com>, Joel Becker <joel.becker@...cle.com>, linux-ext4@...r.kernel.org, vamos@...informatik.uni-erlangen.de Subject: Re: [PATCH] obsolete config in kernel source (BUFFER_DEBUG) On Mon, 8 Feb 2010 10:50:31 -0500 tytso@....edu wrote: > I don't have an objection with removing this, but does anyone have the > latest version of akpm's buffer debugging patches? My version is datestamped four years ago :( It normally forward-ports fairly easily. > I *think* what happened is that akpm forward ported the removed buffer > debugging patches, or maybe rewrote it from scratch, but for whatever > reason they never made back into mainline. Maybe they were too ugly > to live in mainline, but they have been really handy on occasion. I think Eric Sandeen might have a fresher version. Nowadays it should be done with the tracing infrastructure, I guess. Although that infrastructure may not be able to do this - the ext3 debug patch recorded an LRU array of the below structs within every buffer_head. The various BUFFER_TRACE macros would emit a new record into the tail of the target bh's b[] ring. struct buffer_history { struct buffer_history_item { char *function; char *info; unsigned long b_state; unsigned b_list:3; unsigned b_jlist:4; unsigned pg_dirty:1; unsigned cpu:3; unsigned b_count:8; unsigned long b_blocknr; /* For src != dest */ #if defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE) unsigned b_jcount:4; unsigned b_jbd:1; unsigned b_transaction:1; unsigned b_next_transaction:1; unsigned b_cp_transaction:1; unsigned b_trans_is_running:1; unsigned b_trans_is_committing:1; void *b_frozen_data; void *b_committed_data; #endif } b[BUFFER_HISTORY_SIZE]; unsigned long b_history_head; /* Next place to write */ unsigned long b_history_tail; /* Oldest valid entry */ }; -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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