From: ypodemsk@redhat.com
To: Nadav Amit <nadav.amit@gmail.com>
Cc: mtosatti@redhat.com, ppandit@redhat.com,
David Hildenbrand <david@redhat.com>,
"Russell King (Oracle)" <linux@armlinux.org.uk>,
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Heiko Carstens <hca@linux.ibm.com>,
gor@linux.ibm.com, agordeev@linux.ibm.com,
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svens@linux.ibm.com, "David S. Miller" <davem@davemloft.net>,
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Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Kees Cook <keescook@chromium.org>,
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Subject: Re: [PATCH v2 2/2] mm/mmu_gather: send tlb_remove_table_smp_sync IPI only to MM CPUs
Date: Thu, 22 Jun 2023 16:57:39 +0300 [thread overview]
Message-ID: <c08d81286b9986c086e9b68e3440f9bf99086d70.camel@redhat.com> (raw)
In-Reply-To: <10050BB1-15A4-4E84-B900-B21500B2079B@gmail.com>
On Wed, 2023-06-21 at 11:02 -0700, Nadav Amit wrote:
> > On Jun 20, 2023, at 7:46 AM, Yair Podemsky <ypodemsk@redhat.com>
> > wrote:
> >
> > @@ -1525,7 +1525,7 @@ static void collapse_and_free_pmd(struct
> > mm_struct *mm, struct vm_area_struct *v
> > addr + HPAGE_PMD_SIZE);
> > mmu_notifier_invalidate_range_start(&range);
> > pmd = pmdp_collapse_flush(vma, addr, pmdp);
> > - tlb_remove_table_sync_one();
> > + tlb_remove_table_sync_one(mm);
>
> Can’t pmdp_collapse_flush() have one additional argument
> “freed_tables”
> that it would propagate, for instance on x86 to flush_tlb_mm_range()
> ?
> Then you would not need tlb_remove_table_sync_one() to issue an
> additional
> IPI, no?
>
> It just seems that you might still have 2 IPIs in many cases instead
> of
> one, and unless I am missing something, I don’t see why.
>
Hi Nadav,
Thanks for your comment.
I think you are right and in some configurations 2 IPIs might occur.
However I a am not really dealing with the thp code at the moment,
This patch is about the mmu_gatherer and mostly dealing with IPIs sent
via the other code path.
Thanks,
Yair
next prev parent reply other threads:[~2023-06-22 13:58 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-20 14:46 [PATCH v2 0/2] send tlb_remove_table_smp_sync IPI only to necessary CPUs Yair Podemsky
2023-06-20 14:46 ` [PATCH v2 1/2] arch: Introduce ARCH_HAS_CPUMASK_BITS Yair Podemsky
2023-06-20 14:46 ` [PATCH v2 2/2] mm/mmu_gather: send tlb_remove_table_smp_sync IPI only to MM CPUs Yair Podemsky
2023-06-21 17:42 ` Dave Hansen
2023-06-22 13:14 ` ypodemsk
2023-06-22 13:37 ` Dave Hansen
2023-06-26 14:36 ` ypodemsk
2023-06-26 15:23 ` Dave Hansen
2023-06-21 18:02 ` Nadav Amit
2023-06-22 13:57 ` ypodemsk [this message]
2023-06-23 3:38 ` Yang Shi
2023-07-03 13:57 ` Peter Zijlstra
2023-06-21 7:43 ` [PATCH v2 0/2] send tlb_remove_table_smp_sync IPI only to necessary CPUs Peter Zijlstra
2023-06-22 12:47 ` Marcelo Tosatti
2023-07-03 14:09 ` Peter Zijlstra
2023-06-22 13:11 ` ypodemsk
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