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2013-10-09lockstat: Report avg wait and hold timesDavidlohr Bueso1-62/+61
While both the nr and total times are showed, having the avg lock hold and wait times show in the report is quite useful when working on performance related issues. Furthermore, I find myself constantly doing the calculations manually. In addition, some of the documentation examples were changed to easily update them to show the two new columns. No textual change otherwise, as descriptions match the lockstat output. Signed-off-by: Davidlohr Bueso <davidlohr@hp.com> Cc: aswin@hp.com Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1380746928.2313.14.camel@buesod1.americas.hpqcorp.net [ Fixlets: changed a seq_printf() to seq_puts(), converted spaces to tabs. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-02-19locking/stat: Fix a typoYuanhan Liu1-1/+1
s/STATS/STAT Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1359019365-23646-1-git-send-email-yuanhan.liu@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2011-05-28Documentation: Add statistics about nested locksJuri Lelli1-2/+34
Explain what the trailing "/1" on some lock class names of lock_stat output means. Reviewed-by: Yong Zhang <yong.zhang0@gmail.com> Signed-off-by: Juri Lelli <juri.lelli@gmail.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/4DD4F6C1.5090701@gmail.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-05-25mm: Convert i_mmap_lock to a mutexPeter Zijlstra1-1/+1
Straightforward conversion of i_mmap_lock to a mutex. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Hugh Dickins <hughd@google.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Miller <davem@davemloft.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Tony Luck <tony.luck@intel.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-06lockstat: Add usage info to Documentation/lockstat.txtFrank Rowand1-0/+12
Add usage info to Documentation/lockstat.txt Signed-off-by: Frank Rowand <frank.rowand@am.sony.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <4B05BE7D.30500@am.sony.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-20lockstat: contend with pointsPeter Zijlstra1-18/+32
We currently only provide points that have to wait on contention, also lists the points we have to wait for. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-09-05lockstat: documentation updatePeter Zijlstra1-0/+1
Christoph noted that the documentation doesn't tell in what unit the lockstat times are reported, ammend this. Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-08lockstat: documentationPeter Zijlstra1-0/+120
Provide some documentation for CONFIG_LOCK_STAT. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Cc: Rob Landley <rob@landley.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>