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92c48ec231
In the past (like before 2015) we had the familiar workflow of using ENTER to get the menu and then zoom on a pid or DSO, kernel, etc and then use UP and DOWN to navigate further, etc, and then when wanting to go to the previous level, i.e. to Zoom out, use the LEFT arrow key. This way the right hand stays in the arrow keys block that is near the enter and we can go around real quickly. But then, when we started supporting horizontal scrolling by columns to support things like 'perf c2c report' that has lots of columns, we switched to using the LEFT key exclusively for that, horizontal scrolling, requiring the user to press 'm' to get a "context menu" that then would allow users to select the Zoom out operation. Ingo recently reported this as not intuitive, which is true, so lets overload the LEFT key with both meanings, by doing a Zoom out operation if the LEFT key is pressed when we're on the first column, but use it also for horizontal scrolling if it is pressed when the cursor is on column > 1. Reported-by: Ingo Molnar <mingo@kernel.org> Tested-by: Ingo Molnar <mingo@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: James Clark <james.clark@linaro.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/Z_TYux5fUg2pW-pF@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.