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authorHeinz Graalfs <graalfs@linux.vnet.ibm.com>2011-01-21 05:06:53 -0500
committerRobert Richter <robert.richter@amd.com>2011-02-15 05:08:50 -0500
commit997dbb4967da248808850c250182ef2528fff2d1 (patch)
treeb41497541383c2e569b629fbab09fb2280611965 /include/linux/oprofile.h
parentec6a3df1c008d9e8664e53b0363f6847c5c0dc3f (diff)
oprofile, s390: Enhance OProfile to support System zs hardware sampling feature
OProfile is enhanced to export all files for controlling System z's hardware sampling, and to invoke hwsampler exported functions to initialize and use System z's hardware sampling. The patch invokes hwsampler_setup() during oprofile init and exports following hwsampler files under oprofilefs if hwsampler's setup succeeded: A new directory for hardware sampling based files /dev/oprofile/hwsampling/ The userland daemon must explicitly write to the following files to disable (or enable) hardware based sampling /dev/oprofile/hwsampling/hwsampler to modify the actual sampling rate /dev/oprofile/hwsampling/hw_interval to modify the amount of sampling memory (measured in 4K pages) /dev/oprofile/hwsampling/hw_sdbt_blocks The following files are read only and show the possible minimum sampling rate /dev/oprofile/hwsampling/hw_min_interval the possible maximum sampling rate /dev/oprofile/hwsampling/hw_max_interval The patch splits the oprofile_timer_[init/exit] function so that it can be also called through user context (oprofilefs) to avoid kernel oops. Applied with following changes: * whitespace changes in Makefile and timer_int.c Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: Maran Pakkirisamy <maranp@linux.vnet.ibm.com> Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'include/linux/oprofile.h')
-rw-r--r--include/linux/oprofile.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/oprofile.h b/include/linux/oprofile.h
index 7f5cfd3b37dd..b517d869e1ad 100644
--- a/include/linux/oprofile.h
+++ b/include/linux/oprofile.h
@@ -91,6 +91,27 @@ int oprofile_arch_init(struct oprofile_operations * ops);
91 */ 91 */
92void oprofile_arch_exit(void); 92void oprofile_arch_exit(void);
93 93
94#ifdef CONFIG_HAVE_HWSAMPLER
95/**
96 * setup hardware sampler for oprofiling.
97 */
98
99int oprofile_set_hwsampler(unsigned long);
100
101/**
102 * hardware sampler module initialization for the s390 arch
103 */
104
105int oprofile_arch_set_hwsampler(struct oprofile_operations *ops);
106
107/**
108 * Add an s390 hardware sample.
109 */
110void oprofile_add_ext_hw_sample(unsigned long pc, struct pt_regs * const regs,
111 unsigned long event, int is_kernel,
112 struct task_struct *task);
113#endif /* CONFIG_HAVE_HWSAMPLER */
114
94/** 115/**
95 * Add a sample. This may be called from any context. 116 * Add a sample. This may be called from any context.
96 */ 117 */