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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 20 Mar 2026, at 13:53, Lorenzo Stoakes (Oracle) wrote: > (-cc old email) > > On Thu, Mar 19, 2026 at 03:04:08PM -0400, Zi Yan wrote: >> The added folio_split_race_test is a modified C port of the race condi= tion >> test from [1]. The test creates shmem huge pages, where the main threa= d >> punches holes in the shmem to cause folio_split() in the kernel and >> a set of 16 threads reads the shmem to cause filemap_get_entry() in th= e >> kernel. filemap_get_entry() reads the folio and xarray split by >> folio_split() locklessly. The original test[2] is written in rust and = uses >> memfd (shmem backed). This C port uses shmem directly and use a single= >> process. >> >> Note: the initial rust to C conversion is done by Cursor. >> >> Link: https://lore.kernel.org/all/CAKNNEtw5_kZomhkugedKMPOG-sxs5Q5OLum= WJdiWXv+C9Yct0w@mail.gmail.com/ [1] >> Link: https://github.com/dfinity/thp-madv-remove-test [2] >> Signed-off-by: Bas van Dijk >> Signed-off-by: Adam Bratschi-Kaye >> Signed-off-by: Zi Yan > > No .gitignore entry? :) > > (Just saw it flag up locally in git status) > > Linus says don't remove, but he doesn't say don't add :P I did not know about that. The fixup is below. Thank you for pointing it = out. =46rom bd164a7090c0e8b6e3013502c64c161214e38714 Mon Sep 17 00:00:00 2001 From: Zi Yan Date: Fri, 20 Mar 2026 13:56:04 -0400 Subject: [PATCH] git: add generated binary into gitignore Signed-off-by: Zi Yan --- tools/testing/selftests/mm/.gitignore | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selfte= sts/mm/.gitignore index 83ad9454dd9d1..b0c30c5ee9e30 100644 --- a/tools/testing/selftests/mm/.gitignore +++ b/tools/testing/selftests/mm/.gitignore @@ -61,3 +61,4 @@ guard-regions merge prctl_thp_disable rmap +folio_split_race_test -- = 2.51.0 Best Regards, Yan, Zi