From: Borislav Petkov <bp@alien8.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Hemment <markhemm@googlemail.com>,
Andrew Morton <akpm@linux-foundation.org>,
the arch/x86 maintainers <x86@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
patrice.chotard@foss.st.com,
Mikulas Patocka <mpatocka@redhat.com>,
Lukas Czerner <lczerner@redhat.com>,
Christoph Hellwig <hch@lst.de>,
"Darrick J. Wong" <djwong@kernel.org>,
Chuck Lever <chuck.lever@oracle.com>,
Hugh Dickins <hughd@google.com>,
patches@lists.linux.dev, Linux-MM <linux-mm@kvack.org>,
mm-commits@vger.kernel.org, Mel Gorman <mgorman@suse.de>
Subject: Re: [patch 02/14] tmpfs: fix regressions from wider use of ZERO_PAGE
Date: Wed, 4 May 2022 23:01:08 +0200 [thread overview]
Message-ID: <YnLplKy0Y66SsvQw@zn.tnic> (raw)
In-Reply-To: <CAHk-=wiGbrJMim6EWncZUQBzguqy-vtNd+grfNizm5L8Vcmu+w@mail.gmail.com>
On Wed, May 04, 2022 at 01:40:07PM -0700, Linus Torvalds wrote:
> Sadly, I'm on Zen2 with my 3970X, and the Zen 3 threadrippers seem to
> be basically impossible to get.
Yeah, what we did is get a gigabyte board:
[ 0.000000] DMI: GIGABYTE MZ32-AR0-00/MZ32-AR0-00, BIOS M06 07/10/2021
and stick a server CPU in it:
[ 2.352371] smpboot: CPU0: AMD EPYC 7313 16-Core Processor (family: 0x19, model: 0x1, stepping: 0x1)
so that we can have the memory encryption stuff. 32 threads is fairly
decent and kernel builds are fast enough, at least for me. If you need
to do a lot of allmodconfigs, you probably need something bigger though.
> Oh, the clear_user() in the ELF loader? I wouldn't have expected that
> to be noticeable.
Yah, that guy in load_elf_binary(). At least it did hit my breakpoint
fairly often so I thought, what is a benchmark that does create a lot of
processes...
> Now, clear_page() is *very* noticeable, but that has its own special
> magic and doesn't use clear_user().
Yeah, that's with the alternative CALL thing. Could be useful to try to
see how much the inlined rep; movsb would bring...
> Maybe there is some other clear_user() case I never thought of. My
> dim memories of profiles definitely had copy_to_user, clear_page and
> copy_page being some of the top copy loops.
I could try to do a perf probe or whatever fancy new thing we do now on
clear_user to get some numbers of how many times it gets called during
the benchmark run. Or do you wanna know the callers too?
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2022-05-04 21:01 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-15 2:12 incoming Andrew Morton
2022-04-15 2:13 ` [patch 01/14] MAINTAINERS: Broadcom internal lists aren't maintainers Andrew Morton
2022-04-15 2:13 ` [patch 02/14] tmpfs: fix regressions from wider use of ZERO_PAGE Andrew Morton
2022-04-15 22:10 ` Linus Torvalds
2022-04-15 22:21 ` Matthew Wilcox
2022-04-15 22:41 ` Hugh Dickins
2022-04-16 6:36 ` Borislav Petkov
2022-04-16 14:07 ` Mark Hemment
2022-04-16 17:28 ` Borislav Petkov
2022-04-16 17:42 ` Linus Torvalds
2022-04-16 21:15 ` Borislav Petkov
2022-04-17 19:41 ` Borislav Petkov
2022-04-17 20:56 ` Linus Torvalds
2022-04-18 10:15 ` Borislav Petkov
2022-04-18 17:10 ` Linus Torvalds
2022-04-19 9:17 ` Borislav Petkov
2022-04-19 16:41 ` Linus Torvalds
2022-04-19 17:48 ` Borislav Petkov
2022-04-21 15:06 ` Borislav Petkov
2022-04-21 16:50 ` Linus Torvalds
2022-04-21 17:22 ` Linus Torvalds
2022-04-24 19:37 ` Borislav Petkov
2022-04-24 19:54 ` Linus Torvalds
2022-04-24 20:24 ` Linus Torvalds
2022-04-27 0:14 ` Borislav Petkov
2022-04-27 1:29 ` Linus Torvalds
2022-04-27 10:41 ` Borislav Petkov
2022-04-27 16:00 ` Linus Torvalds
2022-05-04 18:56 ` Borislav Petkov
2022-05-04 19:22 ` Linus Torvalds
2022-05-04 20:18 ` Borislav Petkov
2022-05-04 20:40 ` Linus Torvalds
2022-05-04 21:01 ` Borislav Petkov [this message]
2022-05-04 21:09 ` Linus Torvalds
2022-05-10 9:31 ` clear_user (was: [patch 02/14] tmpfs: fix regressions from wider use of ZERO_PAGE) Borislav Petkov
2022-05-10 17:17 ` Linus Torvalds
2022-05-10 17:28 ` Linus Torvalds
2022-05-10 18:10 ` Borislav Petkov
2022-05-10 18:57 ` Borislav Petkov
2022-05-24 12:32 ` [PATCH] x86/clear_user: Make it faster Borislav Petkov
2022-05-24 16:51 ` Linus Torvalds
2022-05-24 17:30 ` Borislav Petkov
2022-05-25 12:11 ` Mark Hemment
2022-05-27 11:28 ` Borislav Petkov
2022-05-27 11:10 ` Ingo Molnar
2022-06-22 14:21 ` Borislav Petkov
2022-06-22 15:06 ` Linus Torvalds
2022-06-22 20:14 ` Borislav Petkov
2022-06-22 21:07 ` Linus Torvalds
2022-06-23 9:41 ` Borislav Petkov
2022-07-05 17:01 ` [PATCH -final] " Borislav Petkov
2022-07-06 9:24 ` Alexey Dobriyan
2022-07-11 10:33 ` Borislav Petkov
2022-07-12 12:32 ` Alexey Dobriyan
2022-08-06 12:49 ` Borislav Petkov
2022-04-15 2:13 ` [patch 03/14] mm/secretmem: fix panic when growing a memfd_secret Andrew Morton
2022-04-15 2:13 ` [patch 04/14] irq_work: use kasan_record_aux_stack_noalloc() record callstack Andrew Morton
2022-04-15 2:13 ` [patch 05/14] kasan: fix hw tags enablement when KUNIT tests are disabled Andrew Morton
2022-04-15 2:13 ` [patch 06/14] mm, kfence: support kmem_dump_obj() for KFENCE objects Andrew Morton
2022-04-15 2:13 ` [patch 07/14] mm, page_alloc: fix build_zonerefs_node() Andrew Morton
2022-04-15 2:13 ` [patch 08/14] mm: fix unexpected zeroed page mapping with zram swap Andrew Morton
2022-04-15 2:13 ` [patch 09/14] mm: compaction: fix compiler warning when CONFIG_COMPACTION=n Andrew Morton
2022-04-15 2:13 ` [patch 10/14] hugetlb: do not demote poisoned hugetlb pages Andrew Morton
2022-04-15 2:13 ` [patch 11/14] revert "fs/binfmt_elf: fix PT_LOAD p_align values for loaders" Andrew Morton
2022-04-15 2:13 ` [patch 12/14] revert "fs/binfmt_elf: use PT_LOAD p_align values for static PIE" Andrew Morton
2022-04-15 2:14 ` [patch 13/14] mm/vmalloc: fix spinning drain_vmap_work after reading from /proc/vmcore Andrew Morton
2022-04-15 2:14 ` [patch 14/14] mm: kmemleak: take a full lowmem check in kmemleak_*_phys() Andrew Morton
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