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([10.239.159.10]) by orsmga006.jf.intel.com with ESMTP; 23 Jul 2022 01:38:03 -0700 From: Yi Sun To: dave.hansen@intel.com, linux-kernel@vger.kernel.org, x86@kernel.org Cc: sohil.mehta@intel.com, tony.luck@intel.com, heng.su@intel.com, yi.sun@intel.com Subject: [PATCH 1/2] x86/fpu: Measure the Latency of XSAVE and XRSTOR Date: Sat, 23 Jul 2022 16:37:59 +0800 Message-Id: <20220723083800.824442-2-yi.sun@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220723083800.824442-1-yi.sun@intel.com> References: <20220723083800.824442-1-yi.sun@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Calculate the latency of instructions xsave and xrstor with new trace points x86_fpu_latency_xsave and x86_fpu_latency_xrstor. The delta TSC can be calculated within a single trace event. Another option considered was to have 2 separated trace events marking the start and finish of the xsave/xrstor instructions. The delta TSC was calculated from the 2 trace points in user space, but there was significant overhead added by the trace function itself. In internal testing, the single trace point option which is implemented here proved to be more accurate. Together with the latency, dump the RFBM(requested-feature bitmap) and XINUSE to identify the type of xsave/xrstor. Trace log looks like following: x86_fpu_latency_xsave: x86/fpu: latency:100 RFBM:0x202e7 XINUSE:0x202 x86_fpu_latency_xrstor: x86/fpu: latency:99 RFBM:0x202e7 XINUSE:0x202 To enable it, CONFIG_X86_DEBUG_FPU and CONFIG_TRACEPOINTS are required. The compiler can get rid of all the extra crust when either of the two configs is disabled. If both of the two configs are enabled, xsave/xrstor_tracing_enabled would be reduced to a static check for tracing enabled. Thus, in the fast path there would be only 2 additional static checks. Since tracepoints can be enabled dynamically, while the code is checking tracepoint_enabled(trace_event), the trace_event could be concurrently enabled. Hence there is probability to get single once noisy result 'trace_clock() - (-1)' at the moment enabling the trace points x86_fpu_latency_*. Leave the noise here instead of additional conditions before calling the x86_fpu_latency_* because that makes the latency more accurate and it's easy to filer the noise out by the following consuming script. Reviewed-by: Sohil Mehta Reviewed-by: Tony Luck Signed-off-by: Yi Sun diff --git a/arch/x86/include/asm/trace/fpu.h b/arch/x86/include/asm/trace/= fpu.h index 4645a6334063..b40328f4e90d 100644 --- a/arch/x86/include/asm/trace/fpu.h +++ b/arch/x86/include/asm/trace/fpu.h @@ -89,6 +89,41 @@ DEFINE_EVENT(x86_fpu, x86_fpu_xstate_check_failed, TP_ARGS(fpu) ); =20 +DECLARE_EVENT_CLASS(x86_fpu_latency, + TP_PROTO(struct fpstate *fpstate, u64 dtsc), + TP_ARGS(fpstate, dtsc), + + TP_STRUCT__entry( + __field(struct fpstate *, fpstate) + __field(u64, dtsc) + __field(u64, rfbm) + __field(u64, xinuse) + ), + + TP_fast_assign( + __entry->fpstate =3D fpstate; + __entry->dtsc =3D dtsc; + __entry->rfbm =3D fpstate->xfeatures; + __entry->xinuse =3D fpstate->regs.xsave.header.xfeatures; + ), + + TP_printk("x86/fpu: latency:%lld RFBM:0x%llx XINUSE:0x%llx", + __entry->dtsc, + __entry->rfbm, + __entry->xinuse + ) +); + +DEFINE_EVENT(x86_fpu_latency, x86_fpu_latency_xsave, + TP_PROTO(struct fpstate *fpstate, u64 dtsc), + TP_ARGS(fpstate, dtsc) +); + +DEFINE_EVENT(x86_fpu_latency, x86_fpu_latency_xrstor, + TP_PROTO(struct fpstate *fpstate, u64 dtsc), + TP_ARGS(fpstate, dtsc) +); + #undef TRACE_INCLUDE_PATH #define TRACE_INCLUDE_PATH asm/trace/ #undef TRACE_INCLUDE_FILE diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h index d22ace092ca2..c5d294e5ee52 100644 --- a/arch/x86/kernel/fpu/xstate.h +++ b/arch/x86/kernel/fpu/xstate.h @@ -5,6 +5,9 @@ #include #include #include +#include + +#include =20 #ifdef CONFIG_X86_64 DECLARE_PER_CPU(u64, xfd_state); @@ -68,6 +71,20 @@ static inline u64 xfeatures_mask_independent(void) return XFEATURE_MASK_INDEPENDENT; } =20 +static inline bool xsave_tracing_enabled(void) +{ + if (!IS_ENABLED(CONFIG_X86_DEBUG_FPU)) + return false; + return tracepoint_enabled(x86_fpu_latency_xsave); +} + +static inline bool xrstor_tracing_enabled(void) +{ + if (!IS_ENABLED(CONFIG_X86_DEBUG_FPU)) + return false; + return tracepoint_enabled(x86_fpu_latency_xrstor); +} + /* XSAVE/XRSTOR wrapper functions */ =20 #ifdef CONFIG_X86_64 @@ -110,7 +127,7 @@ static inline u64 xfeatures_mask_independent(void) * original instruction which gets replaced. We need to use it here as the * address of the instruction where we might get an exception at. */ -#define XSTATE_XSAVE(st, lmask, hmask, err) \ +#define __XSTATE_XSAVE(st, lmask, hmask, err) \ asm volatile(ALTERNATIVE_2(XSAVE, \ XSAVEOPT, X86_FEATURE_XSAVEOPT, \ XSAVES, X86_FEATURE_XSAVES) \ @@ -122,11 +139,22 @@ static inline u64 xfeatures_mask_independent(void) : "D" (st), "m" (*st), "a" (lmask), "d" (hmask) \ : "memory") =20 +#define XSTATE_XSAVE(fps, lmask, hmask, err) \ + do { \ + struct fpstate *f =3D fps; \ + u64 tc =3D -1; \ + if (xsave_tracing_enabled()) \ + tc =3D trace_clock(); \ + __XSTATE_XSAVE(&f->regs.xsave, lmask, hmask, err); \ + if (xsave_tracing_enabled()) \ + trace_x86_fpu_latency_xsave(f, trace_clock() - tc);\ + } while (0) + /* * Use XRSTORS to restore context if it is enabled. XRSTORS supports compa= ct * XSAVE area format. */ -#define XSTATE_XRESTORE(st, lmask, hmask) \ +#define __XSTATE_XRESTORE(st, lmask, hmask) \ asm volatile(ALTERNATIVE(XRSTOR, \ XRSTORS, X86_FEATURE_XSAVES) \ "\n" \ @@ -136,6 +164,17 @@ static inline u64 xfeatures_mask_independent(void) : "D" (st), "m" (*st), "a" (lmask), "d" (hmask) \ : "memory") =20 +#define XSTATE_XRESTORE(fps, lmask, hmask) \ + do { \ + struct fpstate *f =3D fps; \ + u64 tc =3D -1; \ + if (xrstor_tracing_enabled()) \ + tc =3D trace_clock(); \ + __XSTATE_XRESTORE(&f->regs.xsave, lmask, hmask); \ + if (xrstor_tracing_enabled()) \ + trace_x86_fpu_latency_xrstor(f, trace_clock() - tc);\ + } while (0) + #if defined(CONFIG_X86_64) && defined(CONFIG_X86_DEBUG_FPU) extern void xfd_validate_state(struct fpstate *fpstate, u64 mask, bool rst= or); #else @@ -180,7 +219,7 @@ static inline void os_xsave(struct fpstate *fpstate) WARN_ON_FPU(!alternatives_patched); xfd_validate_state(fpstate, mask, false); =20 - XSTATE_XSAVE(&fpstate->regs.xsave, lmask, hmask, err); + XSTATE_XSAVE(fpstate, lmask, hmask, err); =20 /* We should never fault when copying to a kernel buffer: */ WARN_ON_FPU(err); @@ -197,7 +236,7 @@ static inline void os_xrstor(struct fpstate *fpstate, u= 64 mask) u32 hmask =3D mask >> 32; =20 xfd_validate_state(fpstate, mask, true); - XSTATE_XRESTORE(&fpstate->regs.xsave, lmask, hmask); + XSTATE_XRESTORE(fpstate, lmask, hmask); } =20 /* Restore of supervisor state. Does not require XFD */ @@ -207,7 +246,7 @@ static inline void os_xrstor_supervisor(struct fpstate = *fpstate) u32 lmask =3D mask; u32 hmask =3D mask >> 32; =20 - XSTATE_XRESTORE(&fpstate->regs.xsave, lmask, hmask); + XSTATE_XRESTORE(fpstate, lmask, hmask); } =20 /* --=20 2.34.1 From nobody Wed Apr 15 07:02:46 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 11D66C43334 for ; Sat, 23 Jul 2022 08:38:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237187AbiGWIiM (ORCPT ); Sat, 23 Jul 2022 04:38:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56548 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237100AbiGWIiJ (ORCPT ); Sat, 23 Jul 2022 04:38:09 -0400 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DC1A48E90 for ; Sat, 23 Jul 2022 01:38:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1658565488; x=1690101488; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=r/k9KSQvxkL/gid50bxDCxEjFjUBUJkEGgHgOaStIAk=; b=I+Wdgi5x9HNob282rxh2yQOawqoou7R34+3u5/HyyTKt67VDECqnMgyZ OMdj2P/vivfoQiC7VCj+mzP30Qv70UgcFRM4wbJgvInagE42W1JZgmImX pptNtnDnISm69pJDkOEYNP6TpRRDTWwC1nCR/I8CRs/Xih88ZdiY2Qwr/ wpGBZVgpRqA90ew+5kT8rVCxlSQkLrHfnryeoC7JVYkVknyxZgprBNgSl SiWlhJpxDeD/bY06arnyMG5SCjDNUWAzOevdY25SIMhkMZKm8HPqMj7UB WmhW1DVXr2RDaO2fMsqwuebSPHLaKNcufVZz26oN1clV8QCvpYWATw/e6 A==; X-IronPort-AV: E=McAfee;i="6400,9594,10416"; a="285002868" X-IronPort-AV: E=Sophos;i="5.93,187,1654585200"; d="scan'208";a="285002868" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jul 2022 01:38:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,187,1654585200"; d="scan'208";a="574436605" Received: from sunyi-station.sh.intel.com (HELO sunyi-station..) ([10.239.159.10]) by orsmga006.jf.intel.com with ESMTP; 23 Jul 2022 01:38:05 -0700 From: Yi Sun To: dave.hansen@intel.com, linux-kernel@vger.kernel.org, x86@kernel.org Cc: sohil.mehta@intel.com, tony.luck@intel.com, heng.su@intel.com, yi.sun@intel.com Subject: [PATCH 2/2] scripts/x86: Add script to consume trace log of xsave latency Date: Sat, 23 Jul 2022 16:38:00 +0800 Message-Id: <20220723083800.824442-3-yi.sun@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220723083800.824442-1-yi.sun@intel.com> References: <20220723083800.824442-1-yi.sun@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Consume the trace log dumped by tracepoint x86_fpu_latency_xsave and x86_fpu_latency_xrstor, calculate latency ranges for each RFBM and XINUSE combination including min, max, average and 97% tail latency. Add the average of 97% tail latency to remove the unreasonable latency which are introduced by interrupts. By adding the experimental code disabling interrupts before the calculation of the tsc delta, it's obvious to get the 3% tail latency has been filtered. Make use of sqlite3 to make the data statistics more efficient and concise. The output looks like following: EVENTs RFBM XINUSE lat_min lat_max lat_avg lat_avg(97%) Reviewed-by: Tony Luck ---------------------- ------- ------ ------- ------- ------- ------------ x86_fpu_latency_xrstor 0x206e7 0x0 364 364 364 364 x86_fpu_latency_xrstor 0x206e7 0x202 112 1152 300 276 x86_fpu_latency_xsave 0x206e7 0x202 80 278 141 137 x86_fpu_latency_xsave 0x206e7 0x246 108 234 180 177 The xsave latency trace log can be got by two ways: 1. Generated by Kernel debugfs echo 1 > /sys/kernel/debug/tracing/events/x86_fpu/enable cat /sys/kernel/debug/tracing/trace_pipe > trace-log 2. Generated by helper tool like 'trace-cmd' trace-cmd record -e x86_fpu -F trace-cmd report > trace-log Reviewed-by: Tony Luck Signed-off-by: Yi Sun diff --git a/scripts/x86/xsave-latency-trace.sh b/scripts/x86/xsave-latency= -trace.sh new file mode 100755 index 000000000000..d45563984fd6 --- /dev/null +++ b/scripts/x86/xsave-latency-trace.sh @@ -0,0 +1,227 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# (c) 2022 Yi Sun + +trace_log=3D$1 +trace_lat_log=3D".trace_lat_log" +db_name=3D"db_trace" +db_file=3D"${db_name}.db" +table_raw=3D"t_trace" +table_tail=3D"t_trace_tail" +table_results=3D"t_results" +events=3D"x86_fpu_latency_xsave|x86_fpu_latency_xrstor" + +# The regex for the trace log. The rough pattern: +# (proc) (No.cpu) (flags) (timestamp): (tracepoint): latency:(123) RFBM:0x= (123) XINUSE:0x(123)$ +# Fold the regex into 3 parts making it easier to read. +regex1=3D"([^\ ]*)[[:space:]]*\[([0-9]+)\][[:space:]]*(.....\ )?[[:space:]= ]*" +regex2=3D"([0-9.]*):[[:space:]]*([^\ :]*):.*latency:([0-9]*)[[:space:]]*" +regex3=3D"RFBM:(0x[0-9a-f]*)[[:space:]]*XINUSE:(0x[0-9a-f]*)$" + +function usage() { + echo "This script consumes the tracepoint data, and dumps out the" + echo "latency ranges for each RFBM combination." + echo "Usage:" + echo "$0 " + echo " trace-log:" + echo " Either generated by Kernel sysfs:" + echo " echo 1 > /sys/kernel/debug/tracing/events/x86_fpu/enable" + echo " cat /sys/kernel/debug/tracing/trace_pipe > trace-log" + echo "" + echo " Or generate by helper tool like 'trace-cmd':" + echo " trace-cmd record -e x86_fpu" + echo " trace-cmd report > trace-log" +} + +# Check the dependent tools +# {@}: a list of third-part tools +function check_packages() { + for pack in "$@"; do + which $pack >& /dev/null + if [[ $? !=3D 0 ]]; then + echo "Please install $pack before running this script." + exit 1 + fi + done +} + +# Run SQL command with sqlite3 +# ${*}: SQL command fed to sqlite3 +function SQL_CMD() { + sqlite3 $db_file "$*" +} + +# Run SQL command with sqlite3 and format the output with headers and colu= mn. +# ${*}: SQL command fed to sqlite3 +function SQL_CMD_HEADER() { + sqlite3 -column -header $db_file "$*" +} + +# Create a table in the DB +# ${1}=EF=BC=9A name of the table +function create_table() { + if [[ "$1" =3D=3D "" ]]; then + echo "Empty table name!" + exit 1 + fi + SQL_CMD "create table $1 ( + id INTEGER PRIMARY KEY AUTOINCREMENT, + process TEXT, + cpu INT, + timestamp FLOAT, + event_name TEXT, + lat INT, + RFBM INT, + XINUSE INT);" +} + +# Round to the nearest whole number +# ${1}: a float number +# Output: integer +function round() { + echo "scale=3D0; ($1+0.5)/1" | bc +} + +# Insert a record in the trace table +# +# process cpu timestamp event_name lat RFBM XINUSE +# $2 $3 $4 $5 $6 $7 $8 + +function insert_line() { + if [[ "$1" =3D=3D "" ]]; then + echo "Empty table name!" + exit 1 + fi + SQL_CMD "INSERT INTO $1 (process, cpu, timestamp, event_name, lat, RFBM, = XINUSE) + VALUES (\"$2\", $3, $4, \"$5\", $6, $7, $8);" +} + +# Show the results of the trace statistics +function get_latency_stat() { + SQL_CMD "create table $table_results ( + id INTEGER PRIMARY KEY AUTOINCREMENT, + event_name TEXT, + RFBM INT, + XINUSE INT, + lat_min INT, + lat_max INT, + lat_avg INT, + lat_tail_avg INT);" + + for((i=3D0; i<$cnt; i++));do + event_name=3D`get_comb_item $table_raw $i event_name` + RFBM=3D`get_comb_item $table_raw $i RFBM` + XINUSE=3D`get_comb_item $table_raw $i XINUSE` + lat_min=3D`get_comb_item $table_raw $i min\(lat\)` + lat_max=3D`get_comb_item $table_raw $i max\(lat\)` + lat_avg=3D`get_comb_item $table_raw $i avg\(lat\)` + lat_tail_avg=3D`get_comb_item $table_tail $i avg\(lat\)` + + lat_avg=3D`round $lat_avg` + lat_tail_avg=3D`round $lat_tail_avg` + + SQL_CMD "INSERT INTO $table_results + (event_name, RFBM,XINUSE, lat_min, lat_max, lat_avg, lat_tail_avg) + VALUES (\"$event_name\", $RFBM, $XINUSE, $lat_min, $lat_max, + $lat_avg, $lat_tail_avg);" + done + + SQL_CMD_HEADER "select event_name[EVENTs],printf('0x%x',RFBM)[RFBM], + printf('0x%x',XINUSE)[XINUSE],lat_min,lat_max,lat_avg, + lat_tail_avg[lat_avg(97%)] + from $table_results;" +} + +# Get the count of the combination of event_name, RFBM, XINUSE amount all = lat trace records +function get_combs_cnt() { + SQL_CMD "SELECT event_name, RFBM, XINUSE from $table_raw + group by event_name,RFBM,XINUSE;" | wc -l +} + +# Get a specified combination from a table +# ${1}: name of table +# ${2}: the order of the combination of event_name, RFBM, XINUSE +# ${3}: the items which are wanted to be shown +function get_comb_item() { + table=3D$1 + cnt=3D$2 + col=3D$3 + SQL_CMD "SELECT $col from $table group by event_name,RFBM,XINUSE limit $c= nt,1;" +} + +# Get count of the records in a given table +# ${1}: name of the table +function get_rows_cnt() { + table=3D$1 + SQL_CMD "SELECT count(*) from $table;" +} + +# Generate a new table from the raw trace table removing 3% tail traces. +function gen_tail_lat() { + cnt=3D`get_combs_cnt` + create_table $table_tail + + for((i=3D0; i<$cnt; i++));do + create_table t$i + event_name=3D`get_comb_item $table_raw $i event_name` + RFBM=3D`get_comb_item $table_raw $i RFBM` + XINUSE=3D`get_comb_item $table_raw $i XINUSE` + + SQL_CMD "insert into t$i(process,cpu,timestamp,event_name,lat,RFBM,XINUS= E) + select process,cpu,timestamp,event_name,lat,RFBM,XINUSE + from $table_raw where event_name=3D\"$event_name\" and RFBM=3D$RFBM and + XINUSE=3D$XINUSE ORDER BY lat ASC;" + + row=3D`get_rows_cnt t$i` + row=3D`echo "scale=3D0; ($row*0.97 + 0.5)/1" | bc` + + SQL_CMD "insert into $table_tail + (process,cpu,timestamp,event_name,lat,RFBM,XINUSE) + select process,cpu,timestamp,event_name,lat,RFBM,XINUSE + from t$i limit 0,$row;" + done + +} + +if [[ ! -e "$trace_log" || $# !=3D 1 ]];then + usage + exit 1 +fi + +# Check dependency +# Make sure having following packages +check_packages sqlite3 bc wc cut + +# Filter trace log keeping latency related lines only +grep -E "$events" $trace_log > $trace_lat_log +cnt_lines=3D`wc -l $trace_lat_log | cut -d' ' -f1` +# Remove the old db file if it existed before creating +[[ -f $db_file ]] && rm -rf $db_file + +create_table $table_raw + +# Read each line from the temp file and insert into the table +i=3D0 +while IFS=3D read -r line; +do + ((i =3D i + 1)) + echo -ne "(${i}/$cnt_lines) Importing trace log into database!\r" + if [[ "$line" =3D~ ${regex1}${regex2}${regex3} ]]; then + pname=3D${BASH_REMATCH[1]} + cpu=3D${BASH_REMATCH[2]} + ts=3D${BASH_REMATCH[4]} + ename=3D${BASH_REMATCH[5]} + lat=3D${BASH_REMATCH[6]} + ((rfbm=3D${BASH_REMATCH[7]})) + ((xinuse=3D${BASH_REMATCH[8]})) + + insert_line $table_raw $pname $cpu $ts $ename $lat $rfbm $xinuse + fi +done < $trace_lat_log + +gen_tail_lat +get_latency_stat + +# Cleanup +rm -rf $trace_lat_log $db_file --=20 2.34.1