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Date:   Thu, 23 Sep 2021 12:48:03 +0200
From:   Marco Elver <>
To:, Andrew Morton <>
Cc:     Alexander Potapenko <>,
        Dmitry Vyukov <>,
        Jann Horn <>,
        Aleksandr Nogikh <>,
        Taras Madan <>,,,
Subject: [PATCH v3 5/5] kfence: add note to documentation about skipping
 covered allocations

Add a note briefly mentioning the new policy about "skipping currently
covered allocations if pool close to full." Since this has a notable
impact on KFENCE's bug-detection ability on systems with large uptimes,
it is worth pointing out the feature.

Signed-off-by: Marco Elver <>
Reviewed-by: Dmitry Vyukov <>
* Rewrite.
 Documentation/dev-tools/kfence.rst | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/dev-tools/kfence.rst b/Documentation/dev-tools/kfence.rst
index 0fbe3308bf37..d45f952986ae 100644
--- a/Documentation/dev-tools/kfence.rst
+++ b/Documentation/dev-tools/kfence.rst
@@ -269,6 +269,17 @@ tail of KFENCE's freelist, so that the least recently freed objects are reused
 first, and the chances of detecting use-after-frees of recently freed objects
 is increased.
+If pool utilization reaches 75% (default) or above, to reduce the risk of the
+pool eventually being fully occupied by allocated objects yet ensure diverse
+coverage of allocations, KFENCE limits currently covered allocations of the
+same source from further filling up the pool. The "source" of an allocation is
+based on its partial allocation stack trace. A side-effect is that this also
+limits frequent long-lived allocations (e.g. pagecache) of the same source
+filling up the pool permanently, which is the most common risk for the pool
+becoming full and the sampled allocation rate dropping to zero. The threshold
+at which to start limiting currently covered allocations can be configured via
+the boot parameter ``kfence.skip_covered_thresh`` (pool usage%).

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