From: Uladzislau Rezki <urezki@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: "Russell King (Oracle)" <linux@armlinux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Christoph Hellwig <hch@lst.de>,
Uladzislau Rezki <urezki@gmail.com>,
Lorenzo Stoakes <lstoakes@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Baoquan He <bhe@redhat.com>, John Ogness <jogness@linutronix.de>,
linux-arm-kernel@lists.infradead.org,
Mark Rutland <mark.rutland@arm.com>,
Marc Zyngier <maz@kernel.org>,
x86@kernel.org
Subject: Re: Excessive TLB flush ranges
Date: Tue, 16 May 2023 15:42:20 +0200 [thread overview]
Message-ID: <ZGOIPDsTdL2IazdZ@pc636> (raw)
In-Reply-To: <87y1lo7a0z.ffs@tglx>
> _vm_unmap_aliases() collects dirty ranges from per cpu vmap_block_queue
> (what ever that is) and hands a start..end range to
> __purge_vmap_area_lazy().
>
> As I pointed out already, this can also end up being an excessive range
> because there is no guarantee that those individual collected ranges are
> consecutive. Though I have no idea how to cure that right now.
>
> AFAICT this was done to spare flush IPIs, but the mm folks should be
> able to explain that properly.
>
This is done to prevent generating IPIs. That is why the whole range is
calculated once and a flush occurs only once for all lazily registered VAs.
--
Uladzislau Rezki
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next prev parent reply other threads:[~2023-05-16 14:45 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-15 16:43 Excessive TLB flush ranges Thomas Gleixner
2023-05-15 16:59 ` Russell King (Oracle)
2023-05-15 19:46 ` Thomas Gleixner
2023-05-15 21:11 ` Thomas Gleixner
2023-05-15 21:31 ` Russell King (Oracle)
2023-05-16 6:37 ` Thomas Gleixner
2023-05-16 6:46 ` Thomas Gleixner
2023-05-16 8:18 ` Thomas Gleixner
2023-05-16 8:20 ` Thomas Gleixner
2023-05-16 8:27 ` Russell King (Oracle)
2023-05-16 9:03 ` Thomas Gleixner
2023-05-16 10:05 ` Baoquan He
2023-05-16 14:21 ` Thomas Gleixner
2023-05-16 19:03 ` Thomas Gleixner
2023-05-17 9:38 ` Thomas Gleixner
2023-05-17 10:52 ` Baoquan He
2023-05-19 11:22 ` Thomas Gleixner
2023-05-19 11:49 ` Baoquan He
2023-05-19 14:13 ` Thomas Gleixner
2023-05-19 12:01 ` [RFC PATCH 1/3] mm/vmalloc.c: try to flush vmap_area one by one Baoquan He
2023-05-19 14:16 ` Thomas Gleixner
2023-05-19 12:02 ` [RFC PATCH 2/3] mm/vmalloc.c: Only flush VM_FLUSH_RESET_PERMS area immediately Baoquan He
2023-05-19 12:03 ` [RFC PATCH 3/3] mm/vmalloc.c: change _vm_unmap_aliases() to do purge firstly Baoquan He
2023-05-19 14:17 ` Thomas Gleixner
2023-05-19 18:38 ` Thomas Gleixner
2023-05-19 23:46 ` Baoquan He
2023-05-21 23:10 ` Thomas Gleixner
2023-05-22 11:21 ` Baoquan He
2023-05-22 12:02 ` Thomas Gleixner
2023-05-22 14:34 ` Baoquan He
2023-05-22 20:21 ` Thomas Gleixner
2023-05-22 20:44 ` Thomas Gleixner
2023-05-23 9:35 ` Baoquan He
2023-05-19 13:49 ` Excessive TLB flush ranges Thomas Gleixner
2023-05-16 8:21 ` Russell King (Oracle)
2023-05-16 8:19 ` Russell King (Oracle)
2023-05-16 8:44 ` Thomas Gleixner
2023-05-16 8:48 ` Russell King (Oracle)
2023-05-16 12:09 ` Thomas Gleixner
2023-05-16 13:42 ` Uladzislau Rezki [this message]
2023-05-16 14:38 ` Thomas Gleixner
2023-05-16 15:01 ` Uladzislau Rezki
2023-05-16 17:04 ` Thomas Gleixner
2023-05-17 11:26 ` Uladzislau Rezki
2023-05-17 11:58 ` Thomas Gleixner
2023-05-17 12:15 ` Uladzislau Rezki
2023-05-17 16:32 ` Thomas Gleixner
2023-05-19 10:01 ` Uladzislau Rezki
2023-05-19 14:56 ` Thomas Gleixner
2023-05-19 15:14 ` Uladzislau Rezki
2023-05-19 16:32 ` Thomas Gleixner
2023-05-19 17:02 ` Uladzislau Rezki
2023-05-16 17:56 ` Nadav Amit
2023-05-16 19:32 ` Thomas Gleixner
2023-05-17 0:23 ` Thomas Gleixner
2023-05-17 1:23 ` Nadav Amit
2023-05-17 10:31 ` Thomas Gleixner
2023-05-17 11:47 ` Thomas Gleixner
2023-05-17 22:41 ` Nadav Amit
2023-05-17 14:43 ` Mark Rutland
2023-05-17 16:41 ` Thomas Gleixner
2023-05-17 22:57 ` Nadav Amit
2023-05-19 11:49 ` Thomas Gleixner
2023-05-17 12:12 ` Russell King (Oracle)
2023-05-17 23:14 ` Nadav Amit
2023-05-15 18:17 ` Uladzislau Rezki
2023-05-16 2:26 ` Baoquan He
2023-05-16 6:40 ` Thomas Gleixner
2023-05-16 8:07 ` Baoquan He
2023-05-16 8:10 ` Baoquan He
2023-05-16 8:45 ` Russell King (Oracle)
2023-05-16 9:13 ` Thomas Gleixner
2023-05-16 8:54 ` Thomas Gleixner
2023-05-16 9:48 ` Baoquan He
2023-05-15 20:02 ` Nadav Amit
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