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Revision 9c29bcd189f4ab1644b7125713602532d0aefdb7 authored by Eric Dumazet on 21 September 2018, 22:27:48 UTC, committed by David S. Miller on 24 September 2018, 04:55:25 UTC 
mlx5: remove ndo_poll_controller
 
As diagnosed by Song Liu, ndo_poll_controller() can
be very dangerous on loaded hosts, since the cpu
calling ndo_poll_controller() might steal all NAPI
contexts (for all RX/TX queues of the NIC). This capture
can last for unlimited amount of time, since one
cpu is generally not able to drain all the queues under load.

mlx5 uses NAPI for TX completions, so we better let core
networking stack call the napi->poll() to avoid the capture.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent a24b66c
Raw File
intel-pt.h 
/*
 * intel_pt.h: Intel Processor Trace support
 * Copyright (c) 2013-2015, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */

#ifndef INCLUDE__PERF_INTEL_PT_H__
#define INCLUDE__PERF_INTEL_PT_H__

#define INTEL_PT_PMU_NAME "intel_pt"

enum {
	INTEL_PT_PMU_TYPE,
	INTEL_PT_TIME_SHIFT,
	INTEL_PT_TIME_MULT,
	INTEL_PT_TIME_ZERO,
	INTEL_PT_CAP_USER_TIME_ZERO,
	INTEL_PT_TSC_BIT,
	INTEL_PT_NORETCOMP_BIT,
	INTEL_PT_HAVE_SCHED_SWITCH,
	INTEL_PT_SNAPSHOT_MODE,
	INTEL_PT_PER_CPU_MMAPS,
	INTEL_PT_MTC_BIT,
	INTEL_PT_MTC_FREQ_BITS,
	INTEL_PT_TSC_CTC_N,
	INTEL_PT_TSC_CTC_D,
	INTEL_PT_CYC_BIT,
	INTEL_PT_MAX_NONTURBO_RATIO,
	INTEL_PT_FILTER_STR_LEN,
	INTEL_PT_AUXTRACE_PRIV_MAX,
};

struct auxtrace_record;
struct perf_tool;
union perf_event;
struct perf_session;
struct perf_event_attr;
struct perf_pmu;

struct auxtrace_record *intel_pt_recording_init(int *err);

int intel_pt_process_auxtrace_info(union perf_event *event,
				   struct perf_session *session);

struct perf_event_attr *intel_pt_pmu_default_config(struct perf_pmu *pmu);

#endif
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