From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wu Fengguang Subject: [PATCH 9/9] writeback: trace global_dirty_state Date: Wed, 29 Jun 2011 22:52:54 +0800 Message-ID: <20110629145554.698086654@intel.com> References: <20110629145245.835998321@intel.com> Cc: Jan Kara , Dave Chinner , Christoph Hellwig , Andrew Morton , Wu Fengguang To: Return-path: Cc: LKML Content-Disposition: inline; filename=writeback-trace-global-dirty-states.patch Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org Add trace event balance_dirty_state for showing the global dirty page counts and thresholds at each global_dirty_limits() invocation. This will cover the callers throttle_vm_writeout(), over_bground_thresh() and each balance_dirty_pages() loop. Signed-off-by: Wu Fengguang --- include/trace/events/writeback.h | 46 +++++++++++++++++++++++++++++ mm/page-writeback.c | 1 2 files changed, 47 insertions(+) --- linux-next.orig/mm/page-writeback.c 2011-06-29 22:29:34.000000000 +0800 +++ linux-next/mm/page-writeback.c 2011-06-29 22:29:34.000000000 +0800 @@ -442,6 +442,7 @@ void global_dirty_limits(unsigned long * } *pbackground = background; *pdirty = dirty; + trace_global_dirty_state(background, dirty); } /** --- linux-next.orig/include/trace/events/writeback.h 2011-06-29 22:29:34.000000000 +0800 +++ linux-next/include/trace/events/writeback.h 2011-06-29 22:33:30.000000000 +0800 @@ -204,6 +204,52 @@ TRACE_EVENT(writeback_queue_io, __entry->moved) ); +TRACE_EVENT(global_dirty_state, + + TP_PROTO(unsigned long background_thresh, + unsigned long dirty_thresh + ), + + TP_ARGS(background_thresh, + dirty_thresh + ), + + TP_STRUCT__entry( + __field(unsigned long, nr_dirty) + __field(unsigned long, nr_writeback) + __field(unsigned long, nr_unstable) + __field(unsigned long, background_thresh) + __field(unsigned long, dirty_thresh) + __field(unsigned long, dirty_limit) + __field(unsigned long, nr_dirtied) + __field(unsigned long, nr_written) + ), + + TP_fast_assign( + __entry->nr_dirty = global_page_state(NR_FILE_DIRTY); + __entry->nr_writeback = global_page_state(NR_WRITEBACK); + __entry->nr_unstable = global_page_state(NR_UNSTABLE_NFS); + __entry->nr_dirtied = global_page_state(NR_DIRTIED); + __entry->nr_written = global_page_state(NR_WRITTEN); + __entry->background_thresh = background_thresh; + __entry->dirty_thresh = dirty_thresh; + __entry->dirty_limit = global_dirty_limit; + ), + + TP_printk("dirty=%lu writeback=%lu unstable=%lu " + "bg_thresh=%lu thresh=%lu limit=%lu " + "dirtied=%lu written=%lu", + __entry->nr_dirty, + __entry->nr_writeback, + __entry->nr_unstable, + __entry->background_thresh, + __entry->dirty_thresh, + __entry->dirty_limit, + __entry->nr_dirtied, + __entry->nr_written + ) +); + DECLARE_EVENT_CLASS(writeback_congest_waited_template, TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),