Add Single-byte coverage flag for Linux builders [chromium/src : main]

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Struan Shrimpton (Gerrit)

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Jan 26, 2026, 12:34:34 PMJan 26
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File-level comment, Patchset 14 (Latest):
Struan Shrimpton . resolved

lgtm % open comments

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Manuel Briones (Gerrit)

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Jan 29, 2026, 1:40:51 PMJan 29
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Struan Shrimpton . resolved

lgtm % open comments

Manuel Briones

Hey Struan, many thanks for the comments as well:)

Commit Message
Line 7, Patchset 12:Enabled GN flag on Linux Code Coverage builder

Ignore-Freeze: True
Bug: 469798145
Signed-off-by: Manuel Briones <manuel...@google.com>
Ben Pastene . unresolved

nit: Looks like you've got two commit messages here pasted into one. I'd just remove this chunk. The remainder is sufficient as a commit msg for this CL.

Manuel Briones

Ohh I get it. My bad, this was my first commit and didn't know gerrit squashed them. Many thanks:)

File infra/config/generated/luci/project.cfg
Line 10, Patchset 12: version: "1.46.2"
Ben Pastene . resolved

"1.46.2" rolled out quite a while ago. And you can see this change already present on trunk:
https://chromium.googlesource.com/chromium/src/+/HEAD/infra/config/generated/luci/project.cfg

I'd rebase your checkout and your CL. This diff should hopefully disappear after that. LMK if you need help rebasing.

Manuel Briones

Many thanks!! I wanted to do a `git pull --rebase origin main` on my local repo but instead I clicked on the "rebase" button in the UI. It's pretty cool btw! Again, many thanks:)

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Ben Pastene (Gerrit)

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Jan 30, 2026, 2:27:05 PMJan 30
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Ben Pastene . resolved

lgtm, but you'll need an OWNER for the //build/config/coverage/ changes

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    Manuel Briones (Gerrit)

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    Feb 4, 2026, 11:24:39 AMFeb 4
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    Ben Pastene . resolved

    lgtm, but you'll need an OWNER for the //build/config/coverage/ changes

    Manuel Briones

    Thank you so much for the review:)

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    Manuel Briones (Gerrit)

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    Feb 20, 2026, 12:07:25 PM (21 hours ago) Feb 20
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    Commit Message
    Line 7, Patchset 12:Enabled GN flag on Linux Code Coverage builder

    Ignore-Freeze: True
    Bug: 469798145
    Signed-off-by: Manuel Briones <manuel...@google.com>
    Ben Pastene . unresolved

    nit: Looks like you've got two commit messages here pasted into one. I'd just remove this chunk. The remainder is sufficient as a commit msg for this CL.

    Manuel Briones

    Ohh I get it. My bad, this was my first commit and didn't know gerrit squashed them. Many thanks:)

    Manuel Briones

    Hi @bpas...@chromium.org @ssh...@google.com, apologies for the accidental upload! This patchset didn't change any code (it was a metadata/rebase error on my end). If the diff looks clear to you, would you mind re-applying your +1s? Sorry for the noise!

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      Ben Pastene (Gerrit)

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      Feb 20, 2026, 12:42:24 PM (20 hours ago) Feb 20
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      Ben Pastene voted Code-Review+1

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        Struan Shrimpton (Gerrit)

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        Feb 20, 2026, 2:01:08 PM (19 hours ago) Feb 20
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        Votes added by Struan Shrimpton

        Code-Review+1

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        Commit Message
        Line 7, Patchset 12:Enabled GN flag on Linux Code Coverage builder

        Ignore-Freeze: True
        Bug: 469798145
        Signed-off-by: Manuel Briones <manuel...@google.com>
        Ben Pastene . resolved

        nit: Looks like you've got two commit messages here pasted into one. I'd just remove this chunk. The remainder is sufficient as a commit msg for this CL.

        Manuel Briones

        Ohh I get it. My bad, this was my first commit and didn't know gerrit squashed them. Many thanks:)

        Manuel Briones

        Hi @bpas...@chromium.org @ssh...@google.com, apologies for the accidental upload! This patchset didn't change any code (it was a metadata/rebase error on my end). If the diff looks clear to you, would you mind re-applying your +1s? Sorry for the noise!

        Struan Shrimpton

        Done

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          Prakhar Asthana (Gerrit)

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          Prakhar Asthana voted Code-Review+1

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          Chromium LUCI CQ (Gerrit)

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          Feb 20, 2026, 4:31:48 PM (17 hours ago) Feb 20
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          Chromium LUCI CQ submitted the change

          Change information

          Commit message:
          Add Single-byte coverage flag for Linux builders

          Use single-byte coverage on LLVM[1] for a faster, light-weight,
          yet efficient mechanism of counting line hit.

          By replacing 8-byte counters with single-byte counters,
          memory overhead is reduced during coverage builds.

          [1] https://github.com/llvm/llvm-project/pull/75425
          [2] https://discourse.llvm.org/t/rfc-single-byte-counters-for-source-based-code-coverage/75685/12

          R=fzar...@google.com, manuel...@google.com
          Ignore-Freeze: True
          Bug: 469798145
          Change-Id: Ie513c93ab59af254cd7d6dc779adaca7a1f78a05
          Signed-off-by: Manuel Briones <manuel...@google.com>
          Reviewed-by: Struan Shrimpton <ssh...@google.com>
          Reviewed-by: Ben Pastene <bpas...@chromium.org>
          Reviewed-by: Prakhar Asthana <past...@google.com>
          Cr-Commit-Position: refs/heads/main@{#1588055}
          Files:
          • M build/config/coverage/BUILD.gn
          • M build/config/coverage/coverage.gni
          • M infra/config/generated/builders/ci/linux-code-coverage/gn-args.json
          • M infra/config/generated/builders/try/linux-code-coverage/gn-args.json
          • M infra/config/subprojects/chromium/ci/chromium.coverage.star
          Change size: S
          Delta: 5 files changed, 15 insertions(+), 0 deletions(-)
          Branch: refs/heads/main
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          Gerrit-Change-Id: Ie513c93ab59af254cd7d6dc779adaca7a1f78a05
          Gerrit-Change-Number: 7308804
          Gerrit-PatchSet: 17
          Gerrit-Owner: Manuel Briones <manuel...@google.com>
          Gerrit-Reviewer: Ben Pastene <bpas...@chromium.org>
          Gerrit-Reviewer: Chromium LUCI CQ <chromiu...@luci-project-accounts.iam.gserviceaccount.com>
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