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This flag is used to process only fully populated sampling buffers when an sampling event is stopped on a CPU. By default the last sampling buffer is also scanned for samples even if the sampling block full indicator is not set in the trailer entry of a sampling buffer page. This flag can be set via perf_event_attr::config1 field. It was never used and never documented. It is useless now. With PERF_CPUM_SF_FULL_BLOCKS: When a process is scheduled off the CPU, the sampling is stopped and the samples are copied to the perf ring buffer and marked invalid. When stopped at the last full sample buffer page (which is achieved with the PERF_CPUM_SF_FULL_BLOCKS options), the hardware sampling will resume at the first free sample entry in the current, partially filled sample buffer. Without PERF_CPUM_SF_FULL_BLOCKS (default behavior): The partially filled last sample buffer is scanned and valid samples are saved to the perf ring buffer. The valid samples are marked invalid. The sampling is resumed when the process is scheduled on this CPU. Again the hardware sampling will resume at the first free sample entry in the current, partially filled sample buffer. Now the next interrupt handler invocation scans the full sample block and saves the valid samples to the ring buffer. It omits the invalid samples at the top of the buffer. The default behavior is fully sufficient, therefore remove this feature. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Acked-by: Hendrik Brueckner <brueckner@linux.ibm.com> Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
81 lines
3 KiB
C
81 lines
3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Performance event support - s390 specific definitions.
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*
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* Copyright IBM Corp. 2009, 2017
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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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#include <linux/perf_event.h>
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#include <linux/device.h>
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#include <asm/stacktrace.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 definitions 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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#define perf_arch_bpf_user_pt_regs(regs) ®s->user_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 0xffffUL /* Max ctr for ECCTR */
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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_EVENT_CPUM_CF_DIAG 0xBC000UL /* Event: Counter sets */
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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_FREQ_MODE 0x0008 /* Sampling with frequency */
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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 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 SAMPLE_FREQ_MODE(hwc) (SAMPL_FLAGS(hwc) & PERF_CPUM_SF_FREQ_MODE)
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#define perf_arch_fetch_caller_regs(regs, __ip) do { \
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(regs)->psw.addr = (__ip); \
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(regs)->gprs[15] = (unsigned long)__builtin_frame_address(0) - \
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offsetof(struct stack_frame, back_chain); \
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} while (0)
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#endif /* _ASM_S390_PERF_EVENT_H */
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