Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1425212

Re: [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel

Show all headers | View raw

On Fri, Jun 17, 2016 at 11:44:26AM +0200, Julia Lawall wrote:
> I'm not sure that this is worth it.  It adds a dependency on a tool that
> seems not to be well maintained.  In terms of Coccinelle, I'm not sure
> that it gives a big benefit.
> 
> Attached is a graph showing the file selection time for Coccinelle for a
> selection of fairly complex semantic patches.  Coccigrep is just a
> line-by-line regexp search implemented in ocaml, gitgrep uses git grep.
> In most cases, glimpse is clearly faster.
> 
> On the other hand, it seems that glimpse often selects more files.
> Sometimes a few more, eg 16 vs 14, and sometimes quite a lot more, eg 538
> vs 236.  I suspect that this is because glimpse considers _ to be a space,
> and thus it can have many false positives.  There are, however, a few
> cases where glimpse also selects fewer files.
> 
> The file processing time (ie parsing the file, searching for, matches of
> the semantic patch in the file, and performing the transformation) is
> normally much higher than the file selection time.
> 
> So it seems that git grep is currently a better option for the kernel.

Great, thanks, consider this patch dropped, do we want the heuristics
for the cache index in place though or should I drop that as well ?

  Luis

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v2 0/8] coccicheck: modernize "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-17 00:40 +0200
  [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-17 00:40 +0200
    Re: [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel Julia Lawall <julia.lawall@lip6.fr> - 2016-06-17 11:50 +0200
      Re: [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-17 17:20 +0200
        Re: [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel Julia Lawall <julia.lawall@lip6.fr> - 2016-06-17 17:40 +0200
          Re: [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-18 03:30 +0200
            Re: [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel Julia Lawall <julia.lawall@lip6.fr> - 2016-06-18 08:00 +0200
              Re: [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-20 21:20 +0200
            Re: [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel Julia Lawall <julia.lawall@lip6.fr> - 2016-06-18 12:40 +0200
            Re: [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel Julia Lawall <julia.lawall@lip6.fr> - 2016-06-18 12:40 +0200
      Re: [Cocci] [PATCH v2 4/8] scripts: add glimpse.sh for indexing the  kernel SF Markus Elfring <elfring@users.sourceforge.net> - 2016-06-17 17:30 +0200
        Re: [Cocci] [PATCH v2 4/8] scripts: add glimpse.sh for indexing the  kernel Julia Lawall <julia.lawall@lip6.fr> - 2016-06-17 18:20 +0200
  [PATCH v2 2/8] coccicheck: enable parmap support "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-17 00:40 +0200
  [PATCH v2 7/8] coccicheck: refer to coccicheck bottest wiki for documentation "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-17 00:40 +0200
  [PATCH v2 5/8] coccicheck: replace --very-quiet with --quit when debugging "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-17 00:40 +0200
  [PATCH v2 8/8] scripts/coccinelle: require coccinelle >= 1.0.4 on device_node_continue.cocci "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-06-17 00:40 +0200

csiph-web