Re: [PATCH 1/2] mm/damon/core: preserve the caller's quota in damon_new_scheme()

[sashiko-bot@kernel.org]

> damon_new_scheme() calls damos_quota_init() on the caller's quota before
> copying it to the new scheme. This clears the caller's effective quota,
> feedback input and charging state as a side effect.
> 
> damon_commit_ctx() first copies the running context into a temporary
> context for validating the proposed parameters. When
> damon_commit_schemes() creates the temporary schemes, it passes the quota
> of each running scheme to damon_new_scheme(). The quota pointer therefore
> refers to the running scheme, and damos_quota_init() clears that scheme's
> state before it is copied to the temporary scheme. Even an update
> rejected with -EINVAL loses the running quota state.
> 
> For a size quota, this discards the bytes already charged and allows the
> scheme to use a fresh quota before the reset interval has elapsed. For a
> goal-driven quota, the consist tuner loses its accumulated input and
> [ ... ]
> Fixes: 70e0c1d1bf94 ("mm/damon/core: factor out 'damos_quota' private fileds initialization")
> Cc: <stable@vger.kernel.org> # 6.19.x
> Link: https://lore.kernel.org/damon/20260702212143.0CB6D1F00A3D@smtp.kernel.org/ [1]
> Assisted-by: LLM
> Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260921003047.12041-1-kmehltretter@gmail.com?part=1