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fs: add predicts based on nd->depth

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Stats from nd->depth usage during the venerable kernel build collected like so:
bpftrace -e 'kprobe:terminate_walk,kprobe:walk_component,kprobe:legitimize_links
{ @[probe] = lhist(((struct nameidata *)arg0)->depth, 0, 8, 1); }'

@[kprobe:legitimize_links]:
[0, 1)           6554906 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
[1, 2)              3534 |                                                    |

@[kprobe:terminate_walk]:
[0, 1)          12153664 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|

@[kprobe:walk_component]:
[0, 1)          53075749 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
[1, 2)            971421 |                                                    |
[2, 3)             84946 |                                                    |

Additionally a custom probe was added for depth within link_path_walk():
bpftrace -e 'kprobe:link_path_walk_probe { @[probe] = lhist(arg0, 0, 8, 1); }'
@[kprobe:link_path_walk_probe]:
[0, 1)           7528231 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
[1, 2)            407905 |@@                                                  |

Given these results:
1. terminate_walk() is called towards the end of the lookup and in this
   test it never had any links to clean up.
2. legitimize_links() is also called towards the end of lookup and most
   of the time there s 0 depth. Patch consumers to avoid calling into it
   in that case.
3. walk_component() is typically called with WALK_MORE and zero depth,
   checked in that order. Check depth first and predict it is 0.
4. link_path_walk() also does not deal with a symlink most of the time
   when !*name

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://patch.msgid.link/20251119142954.2909394-1-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Mateusz Guzik 2025-11-19 15:29:54 +01:00 • committed by Christian Brauner
commit 7c179096e7
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1 changed files with 7 additions and 6 deletions
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