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[PATCH v1 0/9] early pt: intel processor trace early support

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  [PATCH v1 0/9] early pt: intel processor trace early support Luming Yu <luming.yu@gmail.com> - 2017-09-30 05:20 +0200

#1742469 — [PATCH v1 0/9] early pt: intel processor trace early support

we can use intel processor trace facility since cpu power on
so we can try this patch to do early code analysis at basic block
level.

The basic usage is as below:

#./sptdump
#./sptdecode --pt ptout.0 -e ../linux-test/vmlinux | less
....
                       [+  10] ext4_getblk+159 -> __getblk_gfp
                        [+  13]     __getblk_gfp+30 -> __find_get_block
                        [+ 112]         __find_get_block+167 ->
mark_page_accessed
                        [+   2]     __getblk_gfp+38 -> _cond_resched
                        [+   7]         _cond_resched+16 -> rcu_all_qs
                        [+  35] htree_dirblock_to_tree+324 ->
__ext4_check_dir_entry
                        [+   8] htree_dirblock_to_tree+352 -> ext4fs_dirhash
                        [+  53]     ext4fs_dirhash+196 -> str2hashbuf_signed
                        [+  18] htree_dirblock_to_tree+233 ->
ext4_htree_store_dirent
                        [+  18]     ext4_htree_store_dirent+52 -> __kmalloc
                        [+  10]         __kmalloc+27 -> kmalloc_slab
                        [+   9]         __kmalloc+248 -> _cond_resched
                        [+   7]             _cond_resched+16 -> rcu_all_qs
                        [+  39]         __kmalloc+303 -> __memset
                        [+   4]         __kmalloc+231 -> memcg_kmem_put_cache
                        [+  17]     ext4_htree_store_dirent+114 -> __memcpy
                        [+  14]     ext4_htree_store_dirent+214 ->
rb_insert_color
                        [+  26] htree_dirblock_to_tree+324 ->
__ext4_check_dir_entry
                        [+   8] htree_dirblock_to_tree+352 -> ext4fs_dirhash
                        [+  53]     ext4fs_dirhash+196 -> str2hashbuf_signed
                        [+  18] htree_dirblock_to_tree+233 ->
ext4_htree_store_dirent
                        [+  18]     ext4_htree_store_dirent+52 -> __kmalloc
                        [+  10]         __kmalloc+27 -> kmalloc_slab
                        [+   9]         __kmalloc+248 -> _cond_resched

....
The patch borrows some idea/code and tools from Andi Kleen's
simple-pt project.

Luming Yu(9):
  Basic support for early intel processor trace features with zero deps
  boot option early_pt to enable early pt
  boot option early_pt_buf_len for early pt buffer size setup
  early pt basic addr pair filter support (addr0 && addr1)
  early pt basic addr pair filter support (addr0 && addr1)
  early pt enable mtc freq packet
  enable early pt psb packet
  early pt enable cyc packet
  start early intel processor trace in early boot

 arch/x86/events/Kconfig          |   6 +
 arch/x86/events/intel/Makefile   |   1 +
 arch/x86/events/intel/early_pt.c | 443 +++++++++++++++++++++++++++++++++++++++
 arch/x86/kernel/smpboot.c        |   2 +
 init/main.c                      |   2 +
 kernel/trace/Kconfig             |   2 +-
 6 files changed, 455 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/events/intel/early_pt.c

--
2.7.5

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