linux-kernel - [PATCH v2 1/3] perf/sdt/x86: Add renaming logic for (missing) 8 bit registers

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Date:   Mon, 27 Mar 2017 13:28:27 +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 v2 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

Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
---
 tools/perf/arch/x86/util/perf_regs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/arch/x86/util/perf_regs.c b/tools/perf/arch/x86/util/perf_regs.c
index d8a8dcf..99faab4 100644
--- a/tools/perf/arch/x86/util/perf_regs.c
+++ b/tools/perf/arch/x86/util/perf_regs.c
@@ -40,12 +40,16 @@ 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(ebx, bx),
 	SDT_NAME_REG(rbx, bx),
+	SDT_NAME_REG(bl, ax),
 	SDT_NAME_REG(ecx, cx),
 	SDT_NAME_REG(rcx, cx),
+	SDT_NAME_REG(cl, ax),
 	SDT_NAME_REG(edx, dx),
 	SDT_NAME_REG(rdx, dx),
+	SDT_NAME_REG(dl, ax),
 	SDT_NAME_REG(esi, si),
 	SDT_NAME_REG(rsi, si),
 	SDT_NAME_REG(sil, si),
-- 
2.9.3