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d7528862cf
Add the PERF_CPUM_SF_FULL_BLOCKS flag to process only sample-data-blocks that have the block-full-indicator bit set. Sample-data-blocks that are partially filled are discarded. Use this flag if the sampling buffer is likely to be shared among perf events that use different sampling modes. In such environments, flushing sample-data-blocks that are not completely filled, might cause invalid-data-formats. Setting PERF_CPUM_SF_FULL_BLOCKS prevents potentially invalid sampling data to be processed but, in contrast, also discards valid samples in partially filled sample-data-blocks. Note that sample-data-blocks might not become full for small sampling frequencies or for workload that is scheduled for tiny intervals. To sample with the PERF_CPUM_SF_FULL_BLOCKS flag, set the perf->attr.config1 to 0x0004. For example: perf record -e cpum_sf/config=0xB000,config1=0x0004/ Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
97 lines
3.5 KiB
C
97 lines
3.5 KiB
C
/*
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* Performance event support - s390 specific definitions.
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*
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* Copyright IBM Corp. 2009, 2013
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
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*/
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#ifndef _ASM_S390_PERF_EVENT_H
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#define _ASM_S390_PERF_EVENT_H
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#ifdef CONFIG_64BIT
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#include <linux/perf_event.h>
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#include <linux/device.h>
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#include <asm/cpu_mf.h>
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/* Per-CPU flags for PMU states */
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#define PMU_F_RESERVED 0x1000
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#define PMU_F_ENABLED 0x2000
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#define PMU_F_IN_USE 0x4000
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#define PMU_F_ERR_IBE 0x0100
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#define PMU_F_ERR_LSDA 0x0200
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#define PMU_F_ERR_MASK (PMU_F_ERR_IBE|PMU_F_ERR_LSDA)
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/* Perf defintions for PMU event attributes in sysfs */
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extern __init const struct attribute_group **cpumf_cf_event_group(void);
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extern ssize_t cpumf_events_sysfs_show(struct device *dev,
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struct device_attribute *attr,
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char *page);
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#define EVENT_VAR(_cat, _name) event_attr_##_cat##_##_name
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#define EVENT_PTR(_cat, _name) (&EVENT_VAR(_cat, _name).attr.attr)
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#define CPUMF_EVENT_ATTR(cat, name, id) \
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PMU_EVENT_ATTR(name, EVENT_VAR(cat, name), id, cpumf_events_sysfs_show)
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#define CPUMF_EVENT_PTR(cat, name) EVENT_PTR(cat, name)
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/* Perf callbacks */
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struct pt_regs;
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extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
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extern unsigned long perf_misc_flags(struct pt_regs *regs);
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#define perf_misc_flags(regs) perf_misc_flags(regs)
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/* Perf pt_regs extension for sample-data-entry indicators */
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struct perf_sf_sde_regs {
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unsigned char in_guest:1; /* guest sample */
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unsigned long reserved:63; /* reserved */
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};
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/* Perf PMU definitions for the counter facility */
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#define PERF_CPUM_CF_MAX_CTR 256
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/* Perf PMU definitions for the sampling facility */
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#define PERF_CPUM_SF_MAX_CTR 2
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#define PERF_EVENT_CPUM_SF 0xB0000UL /* Event: Basic-sampling */
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#define PERF_EVENT_CPUM_SF_DIAG 0xBD000UL /* Event: Combined-sampling */
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#define PERF_CPUM_SF_BASIC_MODE 0x0001 /* Basic-sampling flag */
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#define PERF_CPUM_SF_DIAG_MODE 0x0002 /* Diagnostic-sampling flag */
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#define PERF_CPUM_SF_MODE_MASK (PERF_CPUM_SF_BASIC_MODE| \
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PERF_CPUM_SF_DIAG_MODE)
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#define PERF_CPUM_SF_FULL_BLOCKS 0x0004 /* Process full SDBs only */
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#define REG_NONE 0
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#define REG_OVERFLOW 1
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#define OVERFLOW_REG(hwc) ((hwc)->extra_reg.config)
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#define SFB_ALLOC_REG(hwc) ((hwc)->extra_reg.alloc)
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#define RAWSAMPLE_REG(hwc) ((hwc)->config)
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#define TEAR_REG(hwc) ((hwc)->last_tag)
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#define SAMPL_RATE(hwc) ((hwc)->event_base)
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#define SAMPL_FLAGS(hwc) ((hwc)->config_base)
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#define SAMPL_DIAG_MODE(hwc) (SAMPL_FLAGS(hwc) & PERF_CPUM_SF_DIAG_MODE)
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#define SDB_FULL_BLOCKS(hwc) (SAMPL_FLAGS(hwc) & PERF_CPUM_SF_FULL_BLOCKS)
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/* Structure for sampling data entries to be passed as perf raw sample data
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* to user space. Note that raw sample data must be aligned and, thus, might
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* be padded with zeros.
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*/
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struct sf_raw_sample {
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#define SF_RAW_SAMPLE_BASIC PERF_CPUM_SF_BASIC_MODE
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#define SF_RAW_SAMPLE_DIAG PERF_CPUM_SF_DIAG_MODE
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u64 format;
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u32 size; /* Size of sf_raw_sample */
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u16 bsdes; /* Basic-sampling data entry size */
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u16 dsdes; /* Diagnostic-sampling data entry size */
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struct hws_basic_entry basic; /* Basic-sampling data entry */
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struct hws_diag_entry diag; /* Diagnostic-sampling data entry */
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u8 padding[]; /* Padding to next multiple of 8 */
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} __packed;
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/* Perf hardware reserve and release functions */
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int perf_reserve_sampling(void);
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void perf_release_sampling(void);
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#endif /* CONFIG_64BIT */
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#endif /* _ASM_S390_PERF_EVENT_H */
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