subject:"\[RFC PATCH 5\/5\] ixgbe\: kprobes latency test module"

[RFC PATCH 5/5] ixgbe: kprobes latency test module

2013-02-27 Thread Eliezer Tamir

A module to measure time between two symbols.
For each delta compile with EXTRA_CFLAGS="-DSTAGE=$stage"
where stage is from 0 to 20

Signed-off-by: Alexander Duyck 
Signed-off-by: Jesse Brandeburg 
Signed-off-by: Eliezer Tamir 
---

 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |5 -
 samples/kprobes/Makefile  |2 
 samples/kprobes/kprobe_delta.c|  208 +
 3 files changed, 212 insertions(+), 3 deletions(-)
 create mode 100644 samples/kprobes/kprobe_delta.c

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c 
b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 5248c63..c7c8432 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1755,8 +1755,9 @@ static bool ixgbe_add_rx_frag(struct ixgbe_ring *rx_ring,
return true;
 }
 
-static struct sk_buff *ixgbe_fetch_rx_buffer(struct ixgbe_ring *rx_ring,
-union ixgbe_adv_rx_desc *rx_desc)
+static noinline struct sk_buff *ixgbe_fetch_rx_buffer(
+   struct ixgbe_ring *rx_ring,
+   union ixgbe_adv_rx_desc *rx_desc)
 {
struct ixgbe_rx_buffer *rx_buffer;
struct sk_buff *skb;
diff --git a/samples/kprobes/Makefile b/samples/kprobes/Makefile
index 68739bc..5559ea9 100644
--- a/samples/kprobes/Makefile
+++ b/samples/kprobes/Makefile
@@ -1,5 +1,5 @@
 # builds the kprobes example kernel modules;
 # then to use one (as root):  insmod 
 
-obj-$(CONFIG_SAMPLE_KPROBES) += kprobe_example.o jprobe_example.o
+obj-$(CONFIG_SAMPLE_KPROBES) += kprobe_example.o kprobe_delta.o 
jprobe_example.o
 obj-$(CONFIG_SAMPLE_KRETPROBES) += kretprobe_example.o
diff --git a/samples/kprobes/kprobe_delta.c b/samples/kprobes/kprobe_delta.c
new file mode 100644
index 000..88abe63
--- /dev/null
+++ b/samples/kprobes/kprobe_delta.c
@@ -0,0 +1,208 @@
+/*
+ * measure the time between two points in the kernel.
+ * for each stage compile with EXTRA_CFLAGS="-DSTAGE=$stage"
+ * where stage goes from 0 to 20
+ */
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+#ifndef STAGE
+#define STAGE 3
+#endif
+
+#if (STAGE == 0)
+#define START_SYMBOL "ixgbe_fetch_rx_buffer"
+#define END_SYMBOL "__netif_receive_skb"
+#elif (STAGE == 1)
+#define START_SYMBOL "__netif_receive_skb"
+#define END_SYMBOL "tcp_v4_rcv"
+#elif (STAGE == 2)
+#define START_SYMBOL "tcp_v4_rcv"
+#define END_SYMBOL "sys_recvfrom"
+#define END_POST
+#elif (STAGE == 3)
+#define START_SYMBOL "sys_recvfrom"
+#define START_POST
+#define END_SYMBOL "sys_sendto"
+#elif (STAGE == 4)
+#define START_SYMBOL "sys_sendto"
+#define END_SYMBOL "tcp_transmit_skb"
+#elif (STAGE == 5)
+#define START_SYMBOL "tcp_transmit_skb"
+#define END_SYMBOL "dev_queue_xmit"
+#elif (STAGE == 6)
+#define START_SYMBOL "dev_queue_xmit"
+#define END_SYMBOL "ixgbe_xmit_frame"
+#define END_POST
+#elif (STAGE == 7)
+#define START_SYMBOL "ixgbe_fetch_rx_buffer"
+#define END_SYMBOL "ixgbe_xmit_frame"
+#define END_POST
+#elif (STAGE == 8)
+#define START_SYMBOL "__netif_receive_skb"
+#define END_SYMBOL "ixgbe_xmit_frame"
+#define END_POST
+#elif (STAGE == 9)
+#define START_SYMBOL "tcp_v4_rcv"
+#define END_SYMBOL "ixgbe_xmit_frame"
+#define END_POST
+#elif (STAGE == 10)
+#define START_SYMBOL "sys_recvfrom"
+#define START_POST
+#define END_SYMBOL "ixgbe_xmit_frame"
+#define END_POST
+#elif (STAGE == 11)
+#define START_SYMBOL "sys_sendto"
+#define END_SYMBOL "ixgbe_xmit_frame"
+#define END_POST
+#elif (STAGE == 12)
+#define START_SYMBOL "tcp_transmit_skb"
+#define END_SYMBOL "ixgbe_xmit_frame"
+#define END_POST
+#elif (STAGE == 13)
+#define START_SYMBOL "dev_queue_xmit"
+#define END_SYMBOL "ixgbe_xmit_frame"
+#define END_POST
+#elif (STAGE == 14)
+#define START_SYMBOL "ixgbe_fetch_rx_buffer"
+#define END_SYMBOL "__netif_receive_skb"
+#elif (STAGE == 15)
+#define START_SYMBOL "ixgbe_fetch_rx_buffer"
+#define END_SYMBOL "tcp_v4_rcv"
+#elif (STAGE == 16)
+#define START_SYMBOL "ixgbe_fetch_rx_buffer"
+#define END_SYMBOL "sys_recvfrom"
+#define END_POST
+#elif (STAGE == 17)
+#define START_SYMBOL "ixgbe_fetch_rx_buffer"
+#define END_SYMBOL "sys_sendto"
+#elif (STAGE == 18)
+#define START_SYMBOL "ixgbe_fetch_rx_buffer"
+#define END_SYMBOL "tcp_transmit_skb"
+#elif (STAGE == 19)
+#define START_SYMBOL "ixgbe_fetch_rx_buffer"
+#define END_SYMBOL "dev_queue_xmit"
+#elif (STAGE == 20)
+#define START_SYMBOL "ixgbe_fetch_rx_buffer"
+#define END_SYMBOL "ixgbe_xmit_frame"
+#define END_POST
+#endif
+
+/* per-instance private data */
+u64 start_cycles;
+u64 total_cycles;
+bool probe_valid;
+unsigned int sample_count;
+
+static u64 rdtsc(void)
+{
+   unsigned int l, h;
+
+   asm volatile("rdtsc" : "=a" (l), "=d" (h));
+
+   return l | (((u64)h) << 32);
+}
+
+/* Here we use the entry_hanlder to timestamp function entry */
+static int start_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
+{
+   start_cycles =

[RFC PATCH 5/5] ixgbe: kprobes latency test module

2013-02-27 Thread Eliezer Tamir

A module to measure time between two symbols.
For each delta compile with EXTRA_CFLAGS=-DSTAGE=$stage
where stage is from 0 to 20

Signed-off-by: Alexander Duyck alexander.h.du...@intel.com
Signed-off-by: Jesse Brandeburg jesse.brandeb...@intel.com
Signed-off-by: Eliezer Tamir eliezer.ta...@linux.intel.com
---

 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |5 -
 samples/kprobes/Makefile  |2 
 samples/kprobes/kprobe_delta.c|  208 +
 3 files changed, 212 insertions(+), 3 deletions(-)
 create mode 100644 samples/kprobes/kprobe_delta.c

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c 
b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 5248c63..c7c8432 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1755,8 +1755,9 @@ static bool ixgbe_add_rx_frag(struct ixgbe_ring *rx_ring,
return true;
 }
 
-static struct sk_buff *ixgbe_fetch_rx_buffer(struct ixgbe_ring *rx_ring,
-union ixgbe_adv_rx_desc *rx_desc)
+static noinline struct sk_buff *ixgbe_fetch_rx_buffer(
+   struct ixgbe_ring *rx_ring,
+   union ixgbe_adv_rx_desc *rx_desc)
 {
struct ixgbe_rx_buffer *rx_buffer;
struct sk_buff *skb;
diff --git a/samples/kprobes/Makefile b/samples/kprobes/Makefile
index 68739bc..5559ea9 100644
--- a/samples/kprobes/Makefile
+++ b/samples/kprobes/Makefile
@@ -1,5 +1,5 @@
 # builds the kprobes example kernel modules;
 # then to use one (as root):  insmod module_name.ko
 
-obj-$(CONFIG_SAMPLE_KPROBES) += kprobe_example.o jprobe_example.o
+obj-$(CONFIG_SAMPLE_KPROBES) += kprobe_example.o kprobe_delta.o 
jprobe_example.o
 obj-$(CONFIG_SAMPLE_KRETPROBES) += kretprobe_example.o
diff --git a/samples/kprobes/kprobe_delta.c b/samples/kprobes/kprobe_delta.c
new file mode 100644
index 000..88abe63
--- /dev/null
+++ b/samples/kprobes/kprobe_delta.c
@@ -0,0 +1,208 @@
+/*
+ * measure the time between two points in the kernel.
+ * for each stage compile with EXTRA_CFLAGS=-DSTAGE=$stage
+ * where stage goes from 0 to 20
+ */
+
+#include linux/kernel.h
+#include linux/module.h
+#include linux/kprobes.h
+#include linux/ktime.h
+#include linux/limits.h
+#include linux/sched.h
+
+#ifndef STAGE
+#define STAGE 3
+#endif
+
+#if (STAGE == 0)
+#define START_SYMBOL ixgbe_fetch_rx_buffer
+#define END_SYMBOL __netif_receive_skb
+#elif (STAGE == 1)
+#define START_SYMBOL __netif_receive_skb
+#define END_SYMBOL tcp_v4_rcv
+#elif (STAGE == 2)
+#define START_SYMBOL tcp_v4_rcv
+#define END_SYMBOL sys_recvfrom
+#define END_POST
+#elif (STAGE == 3)
+#define START_SYMBOL sys_recvfrom
+#define START_POST
+#define END_SYMBOL sys_sendto
+#elif (STAGE == 4)
+#define START_SYMBOL sys_sendto
+#define END_SYMBOL tcp_transmit_skb
+#elif (STAGE == 5)
+#define START_SYMBOL tcp_transmit_skb
+#define END_SYMBOL dev_queue_xmit
+#elif (STAGE == 6)
+#define START_SYMBOL dev_queue_xmit
+#define END_SYMBOL ixgbe_xmit_frame
+#define END_POST
+#elif (STAGE == 7)
+#define START_SYMBOL ixgbe_fetch_rx_buffer
+#define END_SYMBOL ixgbe_xmit_frame
+#define END_POST
+#elif (STAGE == 8)
+#define START_SYMBOL __netif_receive_skb
+#define END_SYMBOL ixgbe_xmit_frame
+#define END_POST
+#elif (STAGE == 9)
+#define START_SYMBOL tcp_v4_rcv
+#define END_SYMBOL ixgbe_xmit_frame
+#define END_POST
+#elif (STAGE == 10)
+#define START_SYMBOL sys_recvfrom
+#define START_POST
+#define END_SYMBOL ixgbe_xmit_frame
+#define END_POST
+#elif (STAGE == 11)
+#define START_SYMBOL sys_sendto
+#define END_SYMBOL ixgbe_xmit_frame
+#define END_POST
+#elif (STAGE == 12)
+#define START_SYMBOL tcp_transmit_skb
+#define END_SYMBOL ixgbe_xmit_frame
+#define END_POST
+#elif (STAGE == 13)
+#define START_SYMBOL dev_queue_xmit
+#define END_SYMBOL ixgbe_xmit_frame
+#define END_POST
+#elif (STAGE == 14)
+#define START_SYMBOL ixgbe_fetch_rx_buffer
+#define END_SYMBOL __netif_receive_skb
+#elif (STAGE == 15)
+#define START_SYMBOL ixgbe_fetch_rx_buffer
+#define END_SYMBOL tcp_v4_rcv
+#elif (STAGE == 16)
+#define START_SYMBOL ixgbe_fetch_rx_buffer
+#define END_SYMBOL sys_recvfrom
+#define END_POST
+#elif (STAGE == 17)
+#define START_SYMBOL ixgbe_fetch_rx_buffer
+#define END_SYMBOL sys_sendto
+#elif (STAGE == 18)
+#define START_SYMBOL ixgbe_fetch_rx_buffer
+#define END_SYMBOL tcp_transmit_skb
+#elif (STAGE == 19)
+#define START_SYMBOL ixgbe_fetch_rx_buffer
+#define END_SYMBOL dev_queue_xmit
+#elif (STAGE == 20)
+#define START_SYMBOL ixgbe_fetch_rx_buffer
+#define END_SYMBOL ixgbe_xmit_frame
+#define END_POST
+#endif
+
+/* per-instance private data */
+u64 start_cycles;
+u64 total_cycles;
+bool probe_valid;
+unsigned int sample_count;
+
+static u64 rdtsc(void)
+{
+   unsigned int l, h;
+
+   asm volatile(rdtsc : =a (l), =d (h));
+
+   return l | (((u64)h)  32);
+}
+
+/* Here we use the entry_hanlder to timestamp function entry */
+static int

[RFC PATCH 5/5] ixgbe: kprobes latency test module

[RFC PATCH 5/5] ixgbe: kprobes latency test module

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