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Clear Impeller's render target cache when there is memory pressure #193015

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#193497
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Clear Impeller's render target cache when there is memory pressure#193015
#193497
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P2Important issues not at the top of the work listcustomer: bluecustomer: goodlifee: embedderUsers of the Embedder APIteam-engineOwned by Engine teamtriaged-engineTriaged by Engine team

Description

@loic-sharma
loic-sharma
opened on Sep 18, 2026

Background

Impeller uses the RenderTargetCache to cache textures it allocates across frames. This improves performance but results in higher memory usage (for example, see #190613 (comment)).

Solution

When the platform reports memory pressure, an embedder notifies the engine by calling the embedder API's FlutterEngineNotifyLowMemoryWarning. This hook should clear Impeller's render target cache.

Activity

  1. loic-sharma
    added
    e: embedderUsers of the Embedder API
    team-engineOwned by Engine team
    customer: blue
    on Sep 18, 2026
  2. gaaclarke
    added
    P2Important issues not at the top of the work list
    triaged-engineTriaged by Engine team
    on Sep 21, 2026
  3. loic-sharma
    added
    customer: goodlife
    on Oct 1, 2026
  4. auto-submit
    closed this as completedin #193497on Oct 6, 2026
  5. jesswrd
    added a commit that references this issue on Oct 6, 2026

    [Impeller] Add render target cache clearing and test hook (flutter#19…

    575f742

  6. github-actions commented on Oct 20, 2026

    @github-actions
    github-actionsBot
    on Oct 20, 2026 – with GitHub Actions

    This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

  7. github-actions
    locked as resolved and limited conversation to collaborators on Oct 20, 2026
  8. suryaKommana2662
    added a commit that references this issue on Oct 29, 2026

    [Impeller] Add render target cache clearing and test hook (flutter#19…

    07b47f8
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    P2Important issues not at the top of the work listcustomer: bluecustomer: goodlifee: embedderUsers of the Embedder APIteam-engineOwned by Engine teamtriaged-engineTriaged by Engine team

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