linux-kernel - [PATCH v3 1/3] perf/sdt/x86: Add renaming logic for (missing) 8 bit registers

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Message-Id: <20170328094754.3156-2-ravi.bangoria@linux.vnet.ibm.com>
Date:   Tue, 28 Mar 2017 15:17:52 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
To:     acme@...hat.com, mhiramat@...nel.org
Cc:     alexis.berlemont@...il.com, linux-kernel@...r.kernel.org,
        peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com,
        naveen.n.rao@...ux.vnet.ibm.com, mpe@...erman.id.au,
        hemant@...ux.vnet.ibm.com,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: [PATCH v3 1/3] perf/sdt/x86: Add renaming logic for (missing) 8 bit registers

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,

  /usr/bin/qemu-system-s390x
    css_adapter_interrupt: 1@%bl
    css_chpid_add: 1@%cl 1@...l 1@%dl
    dma_bdrv_io: 8@...x 8@...p -8@...4 1@%al

  /usr/bin/postgres
    buffer__read__done: ... -1@...sh -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 too.

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
---
 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 d8a8dcf..fa1fd19 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),
-- 
2.9.3