linux-kernel - Re: [PATCH] gpiolib: fix the speed of descriptor label setting with SRCU

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Date: Tue,  7 May 2024 19:24:57 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Kent Gibson <warthog618@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Neil Armstrong <neil.armstrong@...aro.org>,
	"Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH] gpiolib: fix the speed of descriptor label setting with SRCU

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>


On Tue, 07 May 2024 14:13:46 +0200, Bartosz Golaszewski wrote:
> Commit 1f2bcb8c8ccd ("gpio: protect the descriptor label with SRCU")
> caused a massive drop in performance of requesting GPIO lines due to the
> call to synchronize_srcu() on each label change. Rework the code to not
> wait until all read-only users are done with reading the label but
> instead atomically replace the label pointer and schedule its release
> after all read-only critical sections are done.
> 
> [...]

Applied, thanks!

[1/1] gpiolib: fix the speed of descriptor label setting with SRCU
      commit: a86d27693066a34a29be86f394bbad847b2d1749

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>