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Date: Mon, 17 Nov 2008 21:01:54 -0500 (EST)
From: Steven Rostedt <rostedt@...dmis.org>
To: Paul Mackerras <paulus@...ba.org>
cc: Linus Torvalds <torvalds@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
linuxppc-dev@...abs.org, Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Large stack usage in fs code (especially for PPC64)
On Mon, 17 Nov 2008, Steven Rostedt wrote:
>
> And here's my i386 max stack:
>
> [root@...hel51 ~]# cat /debug/tracing/stack_trace
> Depth Size Location (47 entries)
> ----- ---- --------
> 0) 2216 240 blk_recount_segments+0x39/0x51
> 1) 1976 12 bio_phys_segments+0x16/0x1c
> 2) 1964 20 blk_rq_bio_prep+0x29/0xae
> 3) 1944 16 init_request_from_bio+0xc9/0xcd
> 4) 1928 60 __make_request+0x2f6/0x3c1
> 5) 1868 136 generic_make_request+0x36a/0x3a0
> 6) 1732 56 submit_bio+0xcd/0xd8
> 7) 1676 28 submit_bh+0xd1/0xf0
> 8) 1648 112 block_read_full_page+0x299/0x2a9
> 9) 1536 8 blkdev_readpage+0x14/0x16
> 10) 1528 28 read_cache_page_async+0x7e/0x109
> 11) 1500 16 read_cache_page+0x11/0x49
> 12) 1484 32 read_dev_sector+0x3c/0x72
> 13) 1452 48 read_lba+0x4d/0xaa
> 14) 1404 168 efi_partition+0x85/0x61b
> 15) 1236 84 rescan_partitions+0x14b/0x316
> 16) 1152 40 __blkdev_get+0x1b2/0x258
> 17) 1112 8 blkdev_get+0xf/0x11
> 18) 1104 36 register_disk+0xbc/0x112
> 19) 1068 32 add_disk+0x9f/0xf3
> 20) 1036 48 sd_probe+0x2d4/0x394
> 21) 988 20 driver_probe_device+0xa5/0x120
> 22) 968 8 __device_attach+0xd/0xf
> 23) 960 28 bus_for_each_drv+0x3e/0x67
> 24) 932 24 device_attach+0x56/0x6a
> 25) 908 16 bus_attach_device+0x26/0x4d
> 26) 892 64 device_add+0x380/0x4aa
> 27) 828 28 scsi_sysfs_add_sdev+0xa1/0x1c9
> 28) 800 160 scsi_probe_and_add_lun+0x97e/0xa8f
> 29) 640 36 __scsi_add_device+0x88/0xae
> 30) 604 40 ata_scsi_scan_host+0x8b/0x1cd
> 31) 564 28 ata_host_register+0x1da/0x1ea
> 32) 536 24 ata_host_activate+0x98/0xb5
> 33) 512 188 ahci_init_one+0xa23/0xa4f
> 34) 324 20 pci_device_probe+0x3e/0x5e
> 35) 304 20 driver_probe_device+0xa5/0x120
> 36) 284 20 __driver_attach+0x51/0x70
> 37) 264 32 bus_for_each_dev+0x40/0x62
> 38) 232 12 driver_attach+0x19/0x1b
> 39) 220 28 bus_add_driver+0x9c/0x1ac
> 40) 192 28 driver_register+0x76/0xd2
> 41) 164 20 __pci_register_driver+0x44/0x70
> 42) 144 8 ahci_init+0x14/0x16
> 43) 136 92 _stext+0x4f/0x116
> 44) 44 16 kernel_init+0xf7/0x145
> 45) 28 28 kernel_thread_helper+0x7/0x10
>
> Note, the i386 box had 4KSTACKS defined and the PPC did not have
> IRQSTACKS defined. I'll compile with IRQSTACKS defined and post that
> result.
Here's the PPC32 with IRQSTACKS on:
rostedt@...lum:~$ cat /debug/tracing/stack_trace
Depth Size Location (42 entries)
----- ---- --------
0) 2940 48 ftrace_call+0x4/0x48
1) 2892 16 ide_map_sg+0x4c/0x88
2) 2876 32 ide_build_sglist+0x30/0xa0
3) 2844 64 pmac_ide_dma_setup+0x90/0x2a0
4) 2780 48 do_rw_taskfile+0x250/0x2a0
5) 2732 96 ide_do_rw_disk+0x290/0x2f8
6) 2636 16 ide_gd_do_request+0x30/0x48
7) 2620 176 ide_do_request+0x8e8/0xa70
8) 2444 16 do_ide_request+0x34/0x4c
9) 2428 16 __generic_unplug_device+0x4c/0x64
10) 2412 16 generic_unplug_device+0x4c/0x90
11) 2396 16 blk_unplug+0x34/0x4c
12) 2380 80 dm_table_unplug_all+0x54/0xc0 [dm_mod]
13) 2300 16 dm_unplug_all+0x34/0x54 [dm_mod]
14) 2284 16 blk_unplug+0x34/0x4c
15) 2268 16 blk_backing_dev_unplug+0x28/0x40
16) 2252 16 sync_buffer+0x60/0x80
17) 2236 48 __wait_on_bit+0x78/0xd4
18) 2188 80 out_of_line_wait_on_bit+0x88/0xa0
19) 2108 16 __wait_on_buffer+0x40/0x58
20) 2092 16 __bread+0xbc/0xf0
21) 2076 48 ext3_get_branch+0x90/0x118 [ext3]
22) 2028 208 ext3_get_blocks_handle+0xac/0xa10 [ext3]
23) 1820 48 ext3_get_block+0xc4/0x114 [ext3]
24) 1772 160 do_mpage_readpage+0x26c/0x6f4
25) 1612 144 mpage_readpages+0xe8/0x148
26) 1468 16 ext3_readpages+0x38/0x50 [ext3]
27) 1452 80 __do_page_cache_readahead+0x19c/0x248
28) 1372 32 do_page_cache_readahead+0x80/0x98
29) 1340 80 filemap_fault+0x1b0/0x444
30) 1260 80 __do_fault+0x68/0x61c
31) 1180 64 handle_mm_fault+0x500/0xafc
32) 1116 176 do_page_fault+0x2d4/0x450
33) 940 84 handle_page_fault+0xc/0x80
34) 856 140 0xdeaffa78
35) 716 128 load_elf_binary+0x6a0/0x1048
36) 588 64 search_binary_handler+0x10c/0x310
37) 524 176 load_script+0x248/0x268
38) 348 64 search_binary_handler+0x10c/0x310
39) 284 64 do_execve+0x15c/0x210
40) 220 32 sys_execve+0x68/0x98
41) 188 188 ret_from_syscall+0x0/0x40
It does indeed help.
-- Steve
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