Remove line profiler from performance bar

1. The output isn't great. It can be hard to find hotspots and, even
   when you do find them, to find why those are hotspots.
2. It uses some jQuery-specific frontend code which we can remove now
   that we don't have this any more.
3. It's only possible to profile the initial request, not any subsequent
   AJAX requests.

15 files changed, 7 insertions, 177 deletions

diff --git a/Gemfile b/Gemfile
index d7bc8e1a749..61a6432a953 100644
--- a/Gemfile
+++ b/Gemfile
@@ -297,7 +297,6 @@ gem 'batch-loader', '~> 1.4.0'
 # Perf bar
 gem 'peek', '~> 1.0.1'
 gem 'peek-gc', '~> 0.0.2'
-gem 'peek-rblineprof', '~> 0.2.0'
 
 # Memory benchmarks
 gem 'derailed_benchmarks', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index f9f6616bad2..45f1464a5b5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -643,9 +643,6 @@ GEM
       railties (>= 4.0.0)
     peek-gc (0.0.2)
       peek
-    peek-rblineprof (0.2.0)
-      peek
-      rblineprof
     pg (1.1.4)
     po_to_json (1.0.1)
       json (>= 1.6.0)
@@ -1177,7 +1174,6 @@ DEPENDENCIES
   org-ruby (~> 0.9.12)
   peek (~> 1.0.1)
   peek-gc (~> 0.0.2)
-  peek-rblineprof (~> 0.2.0)
   pg (~> 1.1)
   premailer-rails (~> 1.9.7)
   prometheus-client-mmap (~> 0.9.8)
diff --git a/app/assets/javascripts/performance_bar/components/performance_bar_app.vue b/app/assets/javascripts/performance_bar/components/performance_bar_app.vue
index 769ddb21277..c0ea42ad1a2 100644
--- a/app/assets/javascripts/performance_bar/components/performance_bar_app.vue
+++ b/app/assets/javascripts/performance_bar/components/performance_bar_app.vue
@@ -1,5 +1,4 @@
 <script>
-import $ from 'jquery';
 import { glEmojiTag } from '~/emoji';
 
 import detailedMetric from './detailed_metric.vue';
@@ -28,10 +27,6 @@ export default {
       type: String,
       required: true,
     },
-    profileUrl: {
-      type: String,
-      required: true,
-    },
   },
   detailedMetrics: [
     {
@@ -74,9 +69,6 @@ export default {
     initialRequest() {
       return this.currentRequestId === this.requestId;
     },
-    lineProfileModal() {
-      return $('#modal-peek-line-profile');
-    },
     hasHost() {
       return this.currentRequest && this.currentRequest.details && this.currentRequest.details.host;
     },
@@ -90,10 +82,6 @@ export default {
   },
   mounted() {
     this.currentRequest = this.requestId;
-
-    if (this.lineProfileModal.length) {
-      this.lineProfileModal.modal('toggle');
-    }
   },
   methods: {
     changeCurrentRequest(newRequestId) {
@@ -124,17 +112,6 @@ export default {
         :header="metric.header"
         :keys="metric.keys"
       />
-      <div v-if="initialRequest" id="peek-view-rblineprof" class="view">
-        <button
-          v-if="lineProfileModal.length"
-          class="btn-link btn-blank"
-          data-toggle="modal"
-          data-target="#modal-peek-line-profile"
-        >
-          {{ s__('PerformanceBar|profile') }}
-        </button>
-        <a v-else :href="profileUrl">{{ s__('PerformanceBar|profile') }}</a>
-      </div>
       <div id="peek-view-gc" class="view">
         <span v-if="currentRequest.details" class="bold">
           <span title="Invoke Time">{{ currentRequest.details.gc.gc_time }}</span
diff --git a/app/assets/stylesheets/performance_bar.scss b/app/assets/stylesheets/performance_bar.scss
index 5a8940ffd6d..ad7d87f0bf6 100644
--- a/app/assets/stylesheets/performance_bar.scss
+++ b/app/assets/stylesheets/performance_bar.scss
@@ -1,6 +1,5 @@
 @import 'framework/variables';
 @import 'framework/variables_overrides';
-@import 'peek/views/rblineprof';
 
 #js-peek {
   position: fixed;
@@ -128,13 +127,3 @@
 #modal-peek-pg-queries-content {
   color: $black;
 }
-
-.peek-rblineprof-file {
-  pre.duration {
-    width: 280px;
-  }
-
-  .data {
-    overflow: visible;
-  }
-}
diff --git a/app/controllers/concerns/with_performance_bar.rb b/app/controllers/concerns/with_performance_bar.rb
index 77c3d476ac6..4e0ae3c59eb 100644
--- a/app/controllers/concerns/with_performance_bar.rb
+++ b/app/controllers/concerns/with_performance_bar.rb
@@ -3,10 +3,6 @@
 module WithPerformanceBar
   extend ActiveSupport::Concern
 
-  included do
-    include Peek::Rblineprof::CustomControllerHelpers
-  end
-
   def peek_enabled?
     return false unless Gitlab::PerformanceBar.enabled?(current_user)
 
diff --git a/app/views/peek/_bar.html.haml b/app/views/peek/_bar.html.haml
index 89d3b931f88..5228930293c 100644
--- a/app/views/peek/_bar.html.haml
+++ b/app/views/peek/_bar.html.haml
@@ -2,6 +2,5 @@
 
 #js-peek{ data: { env: Peek.env,
          request_id: Peek.request_id,
-         peek_url: "#{peek_routes_path}/results",
-         profile_url: url_for(safe_params.merge(lineprofiler: 'true')) },
+         peek_url: "#{peek_routes_path}/results" },
          class: Peek.env }
diff --git a/changelogs/unreleased/remove-line-profile-from-performance-bar.yml b/changelogs/unreleased/remove-line-profile-from-performance-bar.yml
new file mode 100644
index 00000000000..c1c7450fbbd
--- /dev/null
+++ b/changelogs/unreleased/remove-line-profile-from-performance-bar.yml
@@ -0,0 +1,5 @@
+---
+title: Remove line profiler from performance bar
+merge_request:
+author:
+type: removed
diff --git a/config/initializers/peek.rb b/config/initializers/peek.rb
index d51d553c939..4a2b7931f30 100644
--- a/config/initializers/peek.rb
+++ b/config/initializers/peek.rb
@@ -7,7 +7,6 @@ Rails.application.config.peek.adapter = :redis, { client: ::Redis.new(Gitlab::Re
 Peek.into Peek::Views::Host
 Peek.into Peek::Views::ActiveRecord
 Peek.into Peek::Views::Gitaly
-Peek.into Peek::Views::Rblineprof
 Peek.into Peek::Views::RedisDetailed
 Peek.into Peek::Views::Rugged
 Peek.into Peek::Views::GC
diff --git a/doc/administration/monitoring/performance/img/performance_bar.png b/doc/administration/monitoring/performance/img/performance_bar.png
index 8a6f8b3b273..89b09054d46 100644
--- a/doc/administration/monitoring/performance/img/performance_bar.png
+++ b/doc/administration/monitoring/performance/img/performance_bar.png
diff --git a/doc/administration/monitoring/performance/img/performance_bar_line_profiling.png b/doc/administration/monitoring/performance/img/performance_bar_line_profiling.png
deleted file mode 100644
index a55ce753101..00000000000
--- a/doc/administration/monitoring/performance/img/performance_bar_line_profiling.png
+++ /dev/null
diff --git a/doc/administration/monitoring/performance/performance_bar.md b/doc/administration/monitoring/performance/performance_bar.md
index 15eab7dcab0..2cc78ccc03c 100644
--- a/doc/administration/monitoring/performance/performance_bar.md
+++ b/doc/administration/monitoring/performance/performance_bar.md
@@ -14,8 +14,6 @@ It allows you to see (from left to right):
   ![Gitaly profiling using the Performance Bar](img/performance_bar_gitaly_calls.png)
 - time taken and number of [Rugged] calls, click through for details of these calls
   ![Rugged profiling using the Performance Bar](img/performance_bar_rugged_calls.png)
-- profile of the code used to generate the page, line by line. In the profile view, the numbers in the left panel represent wall time, cpu time, and number of calls (based on [rblineprof](https://github.com/tmm1/rblineprof)).
-  ![Line profiling using the Performance Bar](img/performance_bar_line_profiling.png)
 - time taken and number of Redis calls, click through for details of these calls
   ![Redis profiling using the Performance Bar](img/performance_bar_redis_calls.png)
 - time taken and number of Ruby GC calls
diff --git a/lib/peek/rblineprof/custom_controller_helpers.rb b/lib/peek/rblineprof/custom_controller_helpers.rb
deleted file mode 100644
index 581cc6a37b4..00000000000
--- a/lib/peek/rblineprof/custom_controller_helpers.rb
+++ /dev/null
@@ -1,124 +0,0 @@
-# frozen_string_literal: true
-
-module Peek
-  module Rblineprof
-    module CustomControllerHelpers
-      extend ActiveSupport::Concern
-
-      # This will become useless once https://github.com/peek/peek-rblineprof/pull/5
-      # is merged
-      def pygmentize(file_name, code, lexer = nil)
-        if lexer.present?
-          Gitlab::Highlight.highlight(file_name, code)
-        else
-          "<pre>#{Rack::Utils.escape_html(code)}</pre>"
-        end
-      end
-
-      # rubocop:disable all
-      def inject_rblineprof
-        ret = nil
-        profile = lineprof(rblineprof_profiler_regex) do
-          ret = yield
-        end
-
-        if response.content_type =~ %r|text/html|
-          sort = params[:lineprofiler_sort]
-          mode = params[:lineprofiler_mode] || 'cpu'
-          min  = (params[:lineprofiler_min] || 5).to_i * 1000
-          summary = params[:lineprofiler_summary]
-
-          # Sort each file by the longest calculated time
-          per_file = profile.map do |file, lines|
-            total, child, excl, total_cpu, child_cpu, excl_cpu = lines[0]
-
-            wall = summary == 'exclusive' ? excl : total
-            cpu  = summary == 'exclusive' ? excl_cpu : total_cpu
-            idle = summary == 'exclusive' ? (excl - excl_cpu) : (total - total_cpu)
-
-            [
-              file, lines,
-              wall, cpu, idle,
-              sort == 'idle' ? idle : sort == 'cpu' ? cpu : wall
-            ]
-          end.sort_by{ |a,b,c,d,e,f| -f }
-
-          output = ["<div class='modal-dialog modal-xl'><div class='modal-content'>"]
-          output << "<div class='modal-header'>"
-          output << "<h4>Line profiling: #{human_description(params[:lineprofiler])}</h4>"
-          output << "<button class='close' type='button' data-dismiss='modal' aria-label='close'><span aria-hidden='true'>&times;</span></button>"
-          output << "</div>"
-          output << "<div class='modal-body'>"
-
-          per_file.each do |file_name, lines, file_wall, file_cpu, file_idle, file_sort|
-            output << "<div class='peek-rblineprof-file'><div class='heading'>"
-
-            show_src = file_sort > min
-            tmpl = show_src ? "<a href='#' class='js-lineprof-file'>%s</a>" : "%s"
-
-            if mode == 'cpu'
-              output << sprintf("<span class='duration'>% 8.1fms + % 8.1fms</span> #{tmpl}", file_cpu / 1000.0, file_idle / 1000.0, file_name.sub(Rails.root.to_s + '/', ''))
-            else
-              output << sprintf("<span class='duration'>% 8.1fms</span> #{tmpl}", file_wall/1000.0, file_name.sub(Rails.root.to_s + '/', ''))
-            end
-
-            output << "</div>" # .heading
-
-            next unless show_src
-
-            output << "<div class='data'>"
-            code = []
-            times = []
-            File.readlines(file_name).each_with_index do |line, i|
-              code << line
-              wall, cpu, calls = lines[i + 1]
-
-              if calls && calls > 0
-                if mode == 'cpu'
-                  idle = wall - cpu
-                  times << sprintf("% 8.1fms + % 8.1fms (% 5d)", cpu / 1000.0, idle / 1000.0, calls)
-                else
-                  times << sprintf("% 8.1fms (% 5d)", wall / 1000.0, calls)
-                end
-              else
-                times << ' '
-              end
-            end
-            output << "<pre class='duration'>#{times.join("\n")}</pre>"
-            # The following line was changed from
-            # https://github.com/peek/peek-rblineprof/blob/8d3b7a283a27de2f40abda45974516693d882258/lib/peek/rblineprof/controller_helpers.rb#L125
-            # This will become useless once https://github.com/peek/peek-rblineprof/pull/16
-            # is merged and is implemented.
-            output << "<pre class='code highlight white'>#{pygmentize(file_name, code.join, 'ruby')}</pre>"
-            output << "</div></div>" # .data then .peek-rblineprof-file
-          end
-
-          output << "</div></div></div>"
-
-          response.body += "<div class='modal' id='modal-peek-line-profile' tabindex=-1>#{output.join}</div>".html_safe
-        end
-
-        ret
-      end
-
-      private
-
-      def human_description(lineprofiler_param)
-        case lineprofiler_param
-        when 'app'
-          'app/ & lib/'
-        when 'views'
-          'app/view/'
-        when 'gems'
-          'vendor/gems'
-        when 'all'
-          'everything in Rails.root'
-        when 'stdlib'
-          'everything in the Ruby standard library'
-        else
-          'app/, config/, lib/, vendor/ & plugin/'
-        end
-      end
-    end
-  end
-end
diff --git a/lib/peek/views/redis_detailed.rb b/lib/peek/views/redis_detailed.rb
index a64ea672895..b95307deddb 100644
--- a/lib/peek/views/redis_detailed.rb
+++ b/lib/peek/views/redis_detailed.rb
@@ -22,7 +22,7 @@ module Gitlab
         detail_store << {
           cmd: args.first,
           duration: duration,
-          backtrace: Gitlab::Profiler.clean_backtrace(caller)
+          backtrace: ::Gitlab::Profiler.clean_backtrace(caller)
         }
       end
 
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index c65f5b22f6e..591dc2a7e39 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -7604,9 +7604,6 @@ msgstr ""
 msgid "PerformanceBar|SQL queries"
 msgstr ""
 
-msgid "PerformanceBar|profile"
-msgstr ""
-
 msgid "PerformanceBar|trace"
 msgstr ""
 
diff --git a/vendor/licenses.csv b/vendor/licenses.csv
index bf6d05c6b6e..0c445aeac88 100644
--- a/vendor/licenses.csv
+++ b/vendor/licenses.csv
@@ -816,7 +816,6 @@ pbkdf2,3.0.14,MIT
 peek,1.0.1,MIT
 peek-gc,0.0.2,MIT
 peek-mysql2,1.1.0,MIT
-peek-rblineprof,0.2.0,MIT
 peek-redis,1.2.0,MIT
 pg,0.18.4,"BSD,ruby,GPL"
 pify,3.0.0,MIT