[llvm] [clang-tools-extra] [clang] [PGO] Sampled instrumentation in PGO to speed up instrumentation binary (PR #69535)

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WenleiHe wrote:

> Hi, Wenlei, I just updated the patch to sync with LLVM head. You can try with option "--mllvm -enable-sampled-instr=true". I resumed work on this from the last few weeks and I'm testing it with some internal benchmarks. One thing that we noticed is that this patch can increase the text size quite a bit and sometimes hits the 2GB relocation limit for large programs. I am thinking of doing a function level sampling so that the text size increase would be minimal. Please let me know if you have any problems with the patch and keep us updated about the performance.
> […](#)
> -Rong
> On Fri, Jan 19, 2024 at 6:51 PM wenlei ***@***.***> wrote: Any follow ups on this patch? Once it's in we'd like to give it a try as well. — Reply to this email directly, view it on GitHub <[#69535 (comment)](https://github.com/llvm/llvm-project/pull/69535#issuecomment-1901669781)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOI42XXW4DZVXN42HYPHGUTYPMWKZAVCNFSM6AAAAAA6GII2ZWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSMBRGY3DSNZYGE> . You are receiving this because you authored the thread.Message ID: ***@***.***>

Thanks. Will do! 

https://github.com/llvm/llvm-project/pull/69535