From: Uladzislau Rezki <urezki@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: "Uladzislau Rezki (Sony)" <urezki@gmail.com>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>, Baoquan He <bhe@redhat.com>,
Lorenzo Stoakes <lstoakes@gmail.com>,
Matthew Wilcox <willy@infradead.org>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
Dave Chinner <david@fromorbit.com>,
"Paul E . McKenney" <paulmck@kernel.org>,
Joel Fernandes <joel@joelfernandes.org>,
Oleksiy Avramchenko <oleksiy.avramchenko@sony.com>
Subject: Re: [PATCH 5/9] mm: vmalloc: Insert busy-VA per-cpu zone
Date: Tue, 23 May 2023 17:00:31 +0200 [thread overview]
Message-ID: <ZGzVD7hkl5v3A2dO@pc636> (raw)
In-Reply-To: <ZGxZOGpaq9ybRLZ7@infradead.org>
On Mon, May 22, 2023 at 11:12:08PM -0700, Christoph Hellwig wrote:
> > /* Look up the first VA which satisfies addr < va_end, NULL if none. */
> > -static struct vmap_area *find_vmap_area_exceed_addr(unsigned long addr)
> > +static struct vmap_area *find_vmap_area_exceed_addr(unsigned long addr, struct rb_root *root)
>
> Please avoid the overly long line.
>
Will fix it.
> > + struct cpu_vmap_zone *z = addr_to_cvz(va->va_start);
> > +
> > /*
> > * Remove from the busy tree/list.
> > */
> > - spin_lock(&vmap_area_lock);
> > - unlink_va(va, &vmap_area_root);
> > - spin_unlock(&vmap_area_lock);
> > + fbl_lock(z, BUSY);
> > + unlink_va(va, &fbl_root(z, BUSY));
> > + fbl_unlock(z, BUSY);
>
> I find the BUSY magic here very confusing, and would prefer to
> just spell the actual lock reference out.
>
No problem. I can make it open-coded. What is about an access to tree/list?
>> unlink_va(va, &fbl_root(z, BUSY));
I mean this one.
--
Uladzislau Rezki
next prev parent reply other threads:[~2023-05-23 15:02 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-22 11:08 [PATCH 0/9] Mitigate a vmap lock contention Uladzislau Rezki (Sony)
2023-05-22 11:08 ` [PATCH 1/9] mm: vmalloc: Add va_alloc() helper Uladzislau Rezki (Sony)
2023-05-23 6:05 ` Christoph Hellwig
2023-05-23 9:57 ` Uladzislau Rezki
2023-05-27 19:55 ` Lorenzo Stoakes
2023-05-22 11:08 ` [PATCH 2/9] mm: vmalloc: Rename adjust_va_to_fit_type() function Uladzislau Rezki (Sony)
2023-05-23 6:06 ` Christoph Hellwig
2023-05-23 10:01 ` Uladzislau Rezki
2023-05-23 17:24 ` Liam R. Howlett
2023-05-24 11:51 ` Uladzislau Rezki
2023-05-27 21:50 ` Lorenzo Stoakes
2023-05-29 20:37 ` Uladzislau Rezki
2023-05-22 11:08 ` [PATCH 3/9] mm: vmalloc: Move vmap_init_free_space() down in vmalloc.c Uladzislau Rezki (Sony)
2023-05-23 6:06 ` Christoph Hellwig
2023-05-27 21:52 ` Lorenzo Stoakes
2023-05-22 11:08 ` [PATCH 4/9] mm: vmalloc: Add a per-CPU-zone infrastructure Uladzislau Rezki (Sony)
2023-05-23 6:08 ` Christoph Hellwig
2023-05-23 14:53 ` Uladzislau Rezki
2023-05-23 15:13 ` Christoph Hellwig
2023-05-23 15:32 ` Uladzislau Rezki
2023-05-22 11:08 ` [PATCH 5/9] mm: vmalloc: Insert busy-VA per-cpu zone Uladzislau Rezki (Sony)
2023-05-23 6:12 ` Christoph Hellwig
2023-05-23 15:00 ` Uladzislau Rezki [this message]
2023-05-22 11:08 ` [PATCH 6/9] mm: vmalloc: Support multiple zones in vmallocinfo Uladzislau Rezki (Sony)
2023-05-22 11:08 ` [PATCH 7/9] mm: vmalloc: Insert lazy-VA per-cpu zone Uladzislau Rezki (Sony)
2023-05-22 11:08 ` [PATCH 8/9] mm: vmalloc: Offload free_vmap_area_lock global lock Uladzislau Rezki (Sony)
[not found] ` <ZH0vuwaSddREy9dz@MiWiFi-R3L-srv>
[not found] ` <ZH7128Q0MiRh6S5f@pc638.lan>
[not found] ` <ZH8iWAgsDSF1I+B6@MiWiFi-R3L-srv>
2023-06-07 6:58 ` Uladzislau Rezki
2023-05-22 11:08 ` [PATCH 9/9] mm: vmalloc: Scale and activate cvz_size Uladzislau Rezki (Sony)
2023-05-23 11:59 ` [PATCH 0/9] Mitigate a vmap lock contention Hyeonggon Yoo
2023-05-23 15:12 ` Uladzislau Rezki
2023-05-23 18:04 ` Hyeonggon Yoo
2023-05-23 21:43 ` Dave Chinner
2023-05-24 1:30 ` Hyeonggon Yoo
2023-05-24 9:50 ` Uladzislau Rezki
2023-05-24 21:56 ` Dave Chinner
2023-05-25 7:59 ` Christoph Hellwig
2023-05-25 10:20 ` Uladzislau Rezki
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