On Wed, Mar 2, 2022 at 6:35 PM Shakeel Butt <shakeelb@xxxxxxxxxx> wrote:
>
> On Wed, Mar 02, 2022 at 02:33:41PM -0800, Ivan Babrou wrote:
> > On Tue, Mar 1, 2022 at 7:40 PM Ivan Babrou <ivan@xxxxxxxxxxxxxx> wrote:
> [...]
>
> Please try the following patch:
* Linux 5.10.101:
$ sudo /usr/share/bcc/tools/funclatency -d 60 workingset_refault
Tracing 1 functions for "workingset_refault"... Hit Ctrl-C to end.
nsecs : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 0 | |
64 -> 127 : 0 | |
128 -> 255 : 0 | |
256 -> 511 : 5496 |****************************************|
512 -> 1023 : 3161 |*********************** |
1024 -> 2047 : 1059 |******* |
2048 -> 4095 : 3149 |********************** |
4096 -> 8191 : 2074 |*************** |
8192 -> 16383 : 90 | |
16384 -> 32767 : 43 | |
32768 -> 65535 : 44 | |
65536 -> 131071 : 12 | |
131072 -> 262143 : 3 | |
262144 -> 524287 : 1 | |
avg = 2144 nsecs, total: 32453571 nsecs, count: 15132
* Linux 5.15.25:
$ sudo /usr/share/bcc/tools/funclatency -d 60 workingset_refault
Tracing 1 functions for "workingset_refault"... Hit Ctrl-C to end.
nsecs : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 0 | |
64 -> 127 : 0 | |
128 -> 255 : 0 | |
256 -> 511 : 132411 |****************************************|
512 -> 1023 : 45547 |************* |
1024 -> 2047 : 5869 |* |
2048 -> 4095 : 10553 |*** |
4096 -> 8191 : 5297 |* |
8192 -> 16383 : 455 | |
16384 -> 32767 : 214 | |
32768 -> 65535 : 175 | |
65536 -> 131071 : 50 | |
131072 -> 262143 : 6 | |
262144 -> 524287 : 2 | |
524288 -> 1048575 : 80 | |
1048576 -> 2097151 : 3228 | |
2097152 -> 4194303 : 13514 |**** |
4194304 -> 8388607 : 792 | |
8388608 -> 16777215 : 1 | |
avg = 221955 nsecs, total: 48429632352 nsecs, count: 218195
* Linux 5.15.25 + delayed flush:
$ sudo /usr/share/bcc/tools/funclatency -d 60 workingset_refault
Tracing 1 functions for "workingset_refault"... Hit Ctrl-C to end.
nsecs : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 0 | |
64 -> 127 : 0 | |
128 -> 255 : 0 | |
256 -> 511 : 103067 |****************************************|
512 -> 1023 : 39054 |*************** |
1024 -> 2047 : 8953 |*** |
2048 -> 4095 : 12986 |***** |
4096 -> 8191 : 10173 |*** |
8192 -> 16383 : 8090 |*** |
16384 -> 32767 : 890 | |
32768 -> 65535 : 540 | |
65536 -> 131071 : 198 | |
131072 -> 262143 : 50 | |
262144 -> 524287 : 7 | |
avg = 1837 nsecs, total: 338115740 nsecs, count: 184008
* Linux 5.15.25 + your latest patch with "if_late":
$ sudo /usr/share/bcc/tools/funclatency -d 60 workingset_refault
Tracing 1 functions for "workingset_refault"... Hit Ctrl-C to end.
nsecs : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 0 | |
64 -> 127 : 0 | |
128 -> 255 : 0 | |
256 -> 511 : 9241 |****************************************|
512 -> 1023 : 7041 |****************************** |
1024 -> 2047 : 1457 |****** |
2048 -> 4095 : 3401 |************** |
4096 -> 8191 : 2207 |********* |
8192 -> 16383 : 130 | |
16384 -> 32767 : 53 | |
32768 -> 65535 : 40 | |
65536 -> 131071 : 16 | |
131072 -> 262143 : 1 | |
262144 -> 524287 : 1 | |
avg = 1663 nsecs, total: 39249164 nsecs, count: 23588
The numbers look pretty good.
