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docs/merging_and_patching.md

+# Introduction
+
+If you have a patch to the master branch (e.g. an important bug fix) that needs to be merged into one of the production V8 branches, read on.
+
+For the examples, a branched 2.4 version of V8 will be used. Substitute "2.4" with your version number.
+
+**An associated issue is mandatory if a patch is merged. This helps with keeping track of merges.**
+
+# Merge process outlined
+
+The merge process in the Chromium and V8 tracker is driven by labels in the form of
+```
+Merge-[Status]-[Branch]
+```
+The currently important labels for V8 are:
+
+  1. Merge-Request-## initiates the process => This fix should be merged into M-##
+  1. Merge-Review-## The merge is not approved yet for M-## e.g. because Canary coverage is missing
+  1. Merge-Approved-## => Simply means that the Chrome TPM are signing the merge off
+  1. Merge-Merged-$BRANCHNUMBER$ => When the merge is done the Merge-Approved label is swapped with this one. $BRANCHNUMBER$ is the name/number of the V8 branch e.g. 4.3 for M-43.
+
+# Instructions for git using the automated script
+
+## How to check if a commit was already merged/reverted
+
+Use mergeinfo.py to get all the commits which are connected to the HASH according to Git.
+
+```
+tools/release/mergeinfo.py HASH
+```
+
+## Step 1: Run the script
+
+Let's assume you're merging revision af3cf11 to branch 2.4 (please specify full git hashes - abbreviations are used here for simplicity).
+
+```
+tools/release/merge_to_branch.py --branch 2.4 af3cf11
+```
+
+Run the script with '-h' to display its help message, which includes more options (e.g. you can specify a file containing your patch, or you can reverse a patch, specify a custom commit message, or resume a merging process you've canceled before). Note that the script will use a temporary checkout of v8 - it won't touch your work space.
+You can also merge more than one revision at once, just list them all.
+
+```
+tools/release/merge_to_branch.py --branch 2.4 af3cf11 cf33f1b sf3cf09
+```
+
+## Step 2:  Send a notification letter to hablich@chromium.org
+
+Saying something like this:
+```
+_Subject:_ Regression fix merged into V8 2.4 branch (Chrome 8)
+
+_Body:_ We have merged a fix to the V8 version 2.4 branch (the version used in Chrome 8)
+
+Version 2.4.9.10: Issue xxx: The parser doesn't parse.
+```
+
+# FAQ
+
+## I get an error during merge that is related to tagging. What should I do?
+When two people are merging at the same time a race-condition can happen in the merge scripts. If this is the case, contact machenbach@chromium.org and hablich@chromium.org.
+## Is there a TL;DR;?
+  1. Create issue
+  1. Add Merge-Request-{Branch} to the issue
+  1. Wait until somebody will add Merge-Approved-{Branch}
+  1. Merge