lockstat: contend with points

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>
author: Peter Zijlstra <a.p.zijlstra@chello.nl> 2008-10-16 17:17:09 -0400
committer: Ingo Molnar <mingo@elte.hu> 2008-10-20 09:43:10 -0400
commit: c7e78cff6b7518212247fb20b1dc6411540dc9af (patch)
tree: 4152afb3e00df125303c4c603e01addc19059ac7 /Documentation/lockstat.txt
parent: 7317d7b87edb41a9135e30be1ec3f7ef817c53dd (diff)
1 files changed, 32 insertions, 18 deletions
diff --git a/Documentation/lockstat.txt b/Documentation/lockstat.txt
index 02f36f5c64f..9cb9138f7a7 100644
--- a/Documentation/lockstat.txt
+++ b/Documentation/lockstat.txt
@@ -71,34 +71,48 @@ Look at the current lock statistics:
 # less /proc/lock_stat
-01 lock_stat version 0.2
+01 lock_stat version 0.3
 02 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 03                               class name    con-bounces    contentions   waittime-min   waittime-max waittime-total    acq-bounces   acquisitions   holdtime-min   holdtime-max holdtime-total
 04 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 05
-06               &inode->i_data.tree_lock-W:            15          21657           0.18     1093295.30 11547131054.85             58          10415           0.16          87.51        6387.60
+06                          &mm->mmap_sem-W:           233            538 18446744073708       22924.27      607243.51           1342          45806           1.71        8595.89     1180582.34
-07               &inode->i_data.tree_lock-R:             0              0           0.00           0.00           0.00          23302         231198           0.25           8.45       98023.38
+07                          &mm->mmap_sem-R:           205            587 18446744073708       28403.36      731975.00           1940         412426           0.58      187825.45     6307502.88
-08               --------------------------
+08                          ---------------
-09                 &inode->i_data.tree_lock              0          [<ffffffff8027c08f>] add_to_page_cache+0x5f/0x190
+09                            &mm->mmap_sem            487          [<ffffffff8053491f>] do_page_fault+0x466/0x928
-10
+10                            &mm->mmap_sem            179          [<ffffffff802a6200>] sys_mprotect+0xcd/0x21d
-11 ...............................................................................................................................................................................................
+11                            &mm->mmap_sem            279          [<ffffffff80210a57>] sys_mmap+0x75/0xce
-12
+12                            &mm->mmap_sem             76          [<ffffffff802a490b>] sys_munmap+0x32/0x59
-13                              dcache_lock:          1037           1161           0.38          45.32         774.51           6611         243371           0.15         306.48       77387.24
+13                          ---------------
-14                              -----------
+14                            &mm->mmap_sem            270          [<ffffffff80210a57>] sys_mmap+0x75/0xce
-15                              dcache_lock            180          [<ffffffff802c0d7e>] sys_getcwd+0x11e/0x230
+15                            &mm->mmap_sem            431          [<ffffffff8053491f>] do_page_fault+0x466/0x928
-16                              dcache_lock            165          [<ffffffff802c002a>] d_alloc+0x15a/0x210
+16                            &mm->mmap_sem            138          [<ffffffff802a490b>] sys_munmap+0x32/0x59
-17                              dcache_lock             33          [<ffffffff8035818d>] _atomic_dec_and_lock+0x4d/0x70
+17                            &mm->mmap_sem            145          [<ffffffff802a6200>] sys_mprotect+0xcd/0x21d
-18                              dcache_lock              1          [<ffffffff802beef8>] shrink_dcache_parent+0x18/0x130
+18
+19 ...............................................................................................................................................................................................
+20
+21                              dcache_lock:           621            623           0.52         118.26        1053.02           6745          91930           0.29         316.29      118423.41
+22                              -----------
+23                              dcache_lock            179          [<ffffffff80378274>] _atomic_dec_and_lock+0x34/0x54
+24                              dcache_lock            113          [<ffffffff802cc17b>] d_alloc+0x19a/0x1eb
+25                              dcache_lock             99          [<ffffffff802ca0dc>] d_rehash+0x1b/0x44
+26                              dcache_lock            104          [<ffffffff802cbca0>] d_instantiate+0x36/0x8a
+27                              -----------
+28                              dcache_lock            192          [<ffffffff80378274>] _atomic_dec_and_lock+0x34/0x54
+29                              dcache_lock             98          [<ffffffff802ca0dc>] d_rehash+0x1b/0x44
+30                              dcache_lock             72          [<ffffffff802cc17b>] d_alloc+0x19a/0x1eb
+31                              dcache_lock            112          [<ffffffff802cbca0>] d_instantiate+0x36/0x8a
 This excerpt shows the first two lock class statistics. Line 01 shows the
 output version - each time the format changes this will be updated. Line 02-04
-show the header with column descriptions. Lines 05-10 and 13-18 show the actual
+show the header with column descriptions. Lines 05-18 and 20-31 show the actual
 statistics. These statistics come in two parts; the actual stats separated by a
-short separator (line 08, 14) from the contention points.
+short separator (line 08, 13) from the contention points.
-The first lock (05-10) is a read/write lock, and shows two lines above the
+The first lock (05-18) is a read/write lock, and shows two lines above the
 short separator. The contention points don't match the column descriptors,
-they have two: contentions and [<IP>] symbol.
+they have two: contentions and [<IP>] symbol. The second set of contention
+points are the points we're contending with.
 The integer part of the time values is in us.
author	Peter Zijlstra <a.p.zijlstra@chello.nl>	2008-10-16 17:17:09 -0400
committer	Ingo Molnar <mingo@elte.hu>	2008-10-20 09:43:10 -0400
commit	c7e78cff6b7518212247fb20b1dc6411540dc9af (patch)
tree	4152afb3e00df125303c4c603e01addc19059ac7 /Documentation/lockstat.txt
parent	7317d7b87edb41a9135e30be1ec3f7ef817c53dd (diff)

diff --git a/Documentation/lockstat.txt b/Documentation/lockstat.txt index 02f36f5c64f..9cb9138f7a7 100644 --- a/Documentation/lockstat.txt +++ b/Documentation/lockstat.txt
@@ -71,34 +71,48 @@ Look at the current lock statistics:
71		71
72	# less /proc/lock_stat	72	# less /proc/lock_stat
73		73
74	01 lock_stat version 0.2	74	01 lock_stat version 0.3
75	02 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------	75	02 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
76	03 class name con-bounces contentions waittime-min waittime-max waittime-total acq-bounces acquisitions holdtime-min holdtime-max holdtime-total	76	03 class name con-bounces contentions waittime-min waittime-max waittime-total acq-bounces acquisitions holdtime-min holdtime-max holdtime-total
77	04 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------	77	04 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
78	05	78	05
79	06 &inode->i_data.tree_lock-W: 15 21657 0.18 1093295.30 11547131054.85 58 10415 0.16 87.51 6387.60	79	06 &mm->mmap_sem-W: 233 538 18446744073708 22924.27 607243.51 1342 45806 1.71 8595.89 1180582.34
80	07 &inode->i_data.tree_lock-R: 0 0 0.00 0.00 0.00 23302 231198 0.25 8.45 98023.38	80	07 &mm->mmap_sem-R: 205 587 18446744073708 28403.36 731975.00 1940 412426 0.58 187825.45 6307502.88
81	08 --------------------------	81	08 ---------------
82	09 &inode->i_data.tree_lock 0 [<ffffffff8027c08f>] add_to_page_cache+0x5f/0x190	82	09 &mm->mmap_sem 487 [<ffffffff8053491f>] do_page_fault+0x466/0x928
83	10	83	10 &mm->mmap_sem 179 [<ffffffff802a6200>] sys_mprotect+0xcd/0x21d
84	11 ...............................................................................................................................................................................................	84	11 &mm->mmap_sem 279 [<ffffffff80210a57>] sys_mmap+0x75/0xce
85	12	85	12 &mm->mmap_sem 76 [<ffffffff802a490b>] sys_munmap+0x32/0x59
86	13 dcache_lock: 1037 1161 0.38 45.32 774.51 6611 243371 0.15 306.48 77387.24	86	13 ---------------
87	14 -----------	87	14 &mm->mmap_sem 270 [<ffffffff80210a57>] sys_mmap+0x75/0xce
88	15 dcache_lock 180 [<ffffffff802c0d7e>] sys_getcwd+0x11e/0x230	88	15 &mm->mmap_sem 431 [<ffffffff8053491f>] do_page_fault+0x466/0x928
89	16 dcache_lock 165 [<ffffffff802c002a>] d_alloc+0x15a/0x210	89	16 &mm->mmap_sem 138 [<ffffffff802a490b>] sys_munmap+0x32/0x59
90	17 dcache_lock 33 [<ffffffff8035818d>] _atomic_dec_and_lock+0x4d/0x70	90	17 &mm->mmap_sem 145 [<ffffffff802a6200>] sys_mprotect+0xcd/0x21d
91	18 dcache_lock 1 [<ffffffff802beef8>] shrink_dcache_parent+0x18/0x130	91	18
		92	19 ...............................................................................................................................................................................................
		93	20
		94	21 dcache_lock: 621 623 0.52 118.26 1053.02 6745 91930 0.29 316.29 118423.41
		95	22 -----------
		96	23 dcache_lock 179 [<ffffffff80378274>] _atomic_dec_and_lock+0x34/0x54
		97	24 dcache_lock 113 [<ffffffff802cc17b>] d_alloc+0x19a/0x1eb
		98	25 dcache_lock 99 [<ffffffff802ca0dc>] d_rehash+0x1b/0x44
		99	26 dcache_lock 104 [<ffffffff802cbca0>] d_instantiate+0x36/0x8a
		100	27 -----------
		101	28 dcache_lock 192 [<ffffffff80378274>] _atomic_dec_and_lock+0x34/0x54
		102	29 dcache_lock 98 [<ffffffff802ca0dc>] d_rehash+0x1b/0x44
		103	30 dcache_lock 72 [<ffffffff802cc17b>] d_alloc+0x19a/0x1eb
		104	31 dcache_lock 112 [<ffffffff802cbca0>] d_instantiate+0x36/0x8a
92		105
93	This excerpt shows the first two lock class statistics. Line 01 shows the	106	This excerpt shows the first two lock class statistics. Line 01 shows the
94	output version - each time the format changes this will be updated. Line 02-04	107	output version - each time the format changes this will be updated. Line 02-04
95	show the header with column descriptions. Lines 05-10 and 13-18 show the actual	108	show the header with column descriptions. Lines 05-18 and 20-31 show the actual
96	statistics. These statistics come in two parts; the actual stats separated by a	109	statistics. These statistics come in two parts; the actual stats separated by a
97	short separator (line 08, 14) from the contention points.	110	short separator (line 08, 13) from the contention points.
98		111
99	The first lock (05-10) is a read/write lock, and shows two lines above the	112	The first lock (05-18) is a read/write lock, and shows two lines above the
100	short separator. The contention points don't match the column descriptors,	113	short separator. The contention points don't match the column descriptors,
101	they have two: contentions and [<IP>] symbol.	114	they have two: contentions and [<IP>] symbol. The second set of contention
		115	points are the points we're contending with.
102		116
103	The integer part of the time values is in us.	117	The integer part of the time values is in us.
104		118