Messages in this thread | | | Date | Thu, 28 Apr 2022 10:13:02 -0700 | Subject | Re: [PATCH v8 23/70] mm/mmap: change do_brk_flags() to expand existing VMA and add do_brk_munmap() | From | Guenter Roeck <> |
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On 4/28/22 09:35, Liam Howlett wrote: > * Guenter Roeck <linux@roeck-us.net> [220428 12:10]: >> On Tue, Apr 26, 2022 at 03:06:35PM +0000, Liam Howlett wrote: >>> From: "Liam R. Howlett" <Liam.Howlett@Oracle.com> >>> >>> Avoid allocating a new VMA when it a vma modification can occur. When a >>> brk() can expand or contract a VMA, then the single store operation will >>> only modify one index of the maple tree instead of causing a node to split >>> or coalesce. This avoids unnecessary allocations/frees of maple tree >>> nodes and VMAs. >>> >>> Move some limit & flag verifications out of the do_brk_flags() function to >>> use only relevant checks in the code path of bkr() and vm_brk_flags(). >>> >>> Set the vma to check if it can expand in vm_brk_flags() if extra criteria >>> are met. >>> >>> Drop userfaultfd from do_brk_flags() path and only use it in >>> vm_brk_flags() path since that is the only place a munmap will happen. >>> >>> Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com> >> >> This patch results in boot failures on alpha. Trying to revert it results >> in conflicts, so I was unable to cross-check. Bisect log attached. The failure >> is silent - boot simply stalls after "random: crng init done", so attaching >> a boot log doesn't add value. > > Thanks. I can only find Gentoo iso for testing, is there any other > options? >
You could try with images from https://github.com/groeck/linux-build-test.
Guenter
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