* [Bug debuginfod/25978] New: improve debuginfod prefetching / fdcache-management logic
@ 2020-05-12 15:41 fche at redhat dot com
2021-06-08 12:21 ` [Bug debuginfod/25978] " nsanci at redhat dot com
2021-07-14 17:41 ` mark at klomp dot org
0 siblings, 2 replies; 3+ messages in thread
From: fche at redhat dot com @ 2020-05-12 15:41 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=25978
Bug ID: 25978
Summary: improve debuginfod prefetching / fdcache-management
logic
Product: elfutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: debuginfod
Assignee: unassigned at sourceware dot org
Reporter: fche at redhat dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
The debuginfod fdcache-prefetch logic has been observed to show some
degeneraacies in operation. Since fdcache evictions are done frequently, and
freshly prefetched archive elements are put at the back of lru[], each eviction
round can summarily nuke things that were just prefetched .... and are just
going to be prefetched again. It would be better to have two lru lists, or
being able to insert newly prefetched entries somewhere in the middle of the
list rather than at the very very end.
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* [Bug debuginfod/25978] improve debuginfod prefetching / fdcache-management logic
2020-05-12 15:41 [Bug debuginfod/25978] New: improve debuginfod prefetching / fdcache-management logic fche at redhat dot com
@ 2021-06-08 12:21 ` nsanci at redhat dot com
2021-07-14 17:41 ` mark at klomp dot org
1 sibling, 0 replies; 3+ messages in thread
From: nsanci at redhat dot com @ 2021-06-08 12:21 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=25978
Noah Sanci <nsanci at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at sourceware dot org |nsanci at redhat dot com
CC| |nsanci at redhat dot com
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* [Bug debuginfod/25978] improve debuginfod prefetching / fdcache-management logic
2020-05-12 15:41 [Bug debuginfod/25978] New: improve debuginfod prefetching / fdcache-management logic fche at redhat dot com
2021-06-08 12:21 ` [Bug debuginfod/25978] " nsanci at redhat dot com
@ 2021-07-14 17:41 ` mark at klomp dot org
1 sibling, 0 replies; 3+ messages in thread
From: mark at klomp dot org @ 2021-07-14 17:41 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=25978
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
CC| |mark at klomp dot org
--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
commit fddaa57358c53ab86856d9ed0089d1b4ec1b7a1e
Author: Noah <nsanci@redhat.com>
Date: Thu Jun 10 10:29:45 2021 -0400
debuginfod: PR25978 - Created the prefetch fdcache
The debuginfod fdcache-prefetch logic has been observed to show some
degeneracies in operation. Since fdcache evictions are done
frequently, and freshly prefetched archive elements are put at the
back of lru[], each eviction round can summarily nuke things that
were just prefetched .... and are just going to be prefetched again.
It would be better to have two lru lists, or being able to insert
newly prefetched entries somewhere in the middle of the list rather
than at the very very end.
https://sourceware.org/bugzilla/show_bug.cgi?id=25978
Signed-off-by: Noah Sanci <nsanci@redhat.com>
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2020-05-12 15:41 [Bug debuginfod/25978] New: improve debuginfod prefetching / fdcache-management logic fche at redhat dot com
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2021-07-14 17:41 ` mark at klomp dot org
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