[lkml]   [2017]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 2/9] perf/sdt/x86: Add renaming logic for (missing) 8 bit registers
From: Ravi Bangoria <>

I found couple of events using al, bl, cl and dl registers for argument.
These are not directly accepted by uprobe_events and thus needs to be
mapped to ax, bx, cx and dx respectively.

Few ex,

css_adapter_interrupt: 1@%bl
css_chpid_add: 1@%cl 1@%sil 1@%dl
dma_bdrv_io: 8@%rbx 8@%rbp -8@%r14 1@%al

buffer__read__done: ... -1@-bash -1@%al
buffer__read__start: ... -1@%al

I don't find any sdt events using ah, bh,... registers. But I also don't
see any reason to not use them, so there might be rare events using
these registers, and if so, perf should have a renaming logic for them

Signed-off-by: Ravi Bangoria <>
Acked-by: Masami Hiramatsu <>
Cc: Alexander Shishkin <>
Cc: Alexis Berlemont <>
Cc: Hemant Kumar <>
Cc: Michael Ellerman <>
Cc: Naveen N. Rao <>
Cc: Peter Zijlstra <>
Signed-off-by: Arnaldo Carvalho de Melo <>
tools/perf/arch/x86/util/perf_regs.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/tools/perf/arch/x86/util/perf_regs.c b/tools/perf/arch/x86/util/perf_regs.c
index d8a8dcf761f7..fa1fd196837d 100644
--- a/tools/perf/arch/x86/util/perf_regs.c
+++ b/tools/perf/arch/x86/util/perf_regs.c
@@ -40,12 +40,20 @@ struct sdt_name_reg {
static const struct sdt_name_reg sdt_reg_renamings[] = {
SDT_NAME_REG(eax, ax),
SDT_NAME_REG(rax, ax),
+ SDT_NAME_REG(al, ax),
+ SDT_NAME_REG(ah, ax),
SDT_NAME_REG(ebx, bx),
SDT_NAME_REG(rbx, bx),
+ SDT_NAME_REG(bl, bx),
+ SDT_NAME_REG(bh, bx),
SDT_NAME_REG(ecx, cx),
SDT_NAME_REG(rcx, cx),
+ SDT_NAME_REG(cl, cx),
+ SDT_NAME_REG(ch, cx),
SDT_NAME_REG(edx, dx),
SDT_NAME_REG(rdx, dx),
+ SDT_NAME_REG(dl, dx),
+ SDT_NAME_REG(dh, dx),
SDT_NAME_REG(esi, si),
SDT_NAME_REG(rsi, si),
SDT_NAME_REG(sil, si),
 \ /
  Last update: 2017-04-01 04:13    [W:0.089 / U:0.548 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site