From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 070CBC433EF for ; Fri, 26 Nov 2021 21:26:30 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 653D56B0075; Fri, 26 Nov 2021 16:26:19 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 602196B0078; Fri, 26 Nov 2021 16:26:19 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4F10A6B007B; Fri, 26 Nov 2021 16:26:19 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0099.hostedemail.com [216.40.44.99]) by kanga.kvack.org (Postfix) with ESMTP id 403716B0075 for ; Fri, 26 Nov 2021 16:26:19 -0500 (EST) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id EA2D082D81 for ; Fri, 26 Nov 2021 21:26:08 +0000 (UTC) X-FDA: 78852364458.26.6E4DAC9 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by imf17.hostedemail.com (Postfix) with ESMTP id 53CE4F0001EA for ; Fri, 26 Nov 2021 21:26:08 +0000 (UTC) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1637961967; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=WjNUKG+s4Ps6r9zLUOn5nxDOIRtHOKUgQW134JHaKqA=; b=R4JIywl7ZbItEW3yhvSHkyA5fdPrGPcSzi9z2XIywE8OB2SOlRnSGfIMftPWUGgjWkkB1l tnqHNeVTvegOL+8EpCYrXsaF49Jbwd1hVkznuH1p0cZl6fvfHSBvRZAsc8HlcZ83ByJkOd BbZrfhUW6OINrRi/T3j67J2YAdh222SQ/Rp/hJVrkQ7zltGs4Mh4e/NuBzN7QICZLpl/zL dj0KA/d0N0i5KzdFZo/vAfD31v3+EByGzG46ItN8i14nX+jDLfjoR9e0FQpAPSnOwoZ6wm YBWAk3vRy7XPfcgnJl/c5NWiqbndeIMcvrZgjf6vSHPHbgw7+Y6tZdO9LZoOIQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1637961967; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=WjNUKG+s4Ps6r9zLUOn5nxDOIRtHOKUgQW134JHaKqA=; b=6TZNzD8/CFcvWt1+cHtze92ARSCHNIQ9lcjE40DBzdEnafmhCTxpeOKsNA44tZ5RG2CIBu Ti1ZHyTkfwZaInDw== To: SeongJae Park , akpm@linux-foundation.org Cc: oleksandr@natalenko.name, john.stultz@linaro.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, SeongJae Park Subject: Re: [PATCH v3 1/2] timers: Implement usleep_idle_range() In-Reply-To: <20211126145015.15862-2-sj@kernel.org> References: <20211126145015.15862-1-sj@kernel.org> <20211126145015.15862-2-sj@kernel.org> Date: Fri, 26 Nov 2021 22:26:06 +0100 Message-ID: <874k7yhamp.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 53CE4F0001EA X-Stat-Signature: mnf3kjh89qbn4rdhqjkt4k76tfou4inp Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=linutronix.de header.s=2020 header.b=R4JIywl7; dkim=pass header.d=linutronix.de header.s=2020e header.b="6TZNzD8/"; spf=pass (imf17.hostedemail.com: domain of tglx@linutronix.de designates 193.142.43.55 as permitted sender) smtp.mailfrom=tglx@linutronix.de; dmarc=pass (policy=none) header.from=linutronix.de X-HE-Tag: 1637961968-831870 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Nov 26 2021 at 14:50, SeongJae Park wrote: > Some kernel threads such as DAMON could need to repeatedly sleep in > micro seconds level. Because usleep_range() sleeps in uninterruptible > state, however, such threads would make /proc/loadavg reports fake load. > > To help such cases, this commit implements a variant of usleep_range() > called usleep_idle_range(). It is same to usleep_range() but sets the > state of the current task as TASK_IDLE while sleeping. > > Suggested-by: Andrew Morton > Signed-off-by: SeongJae Park Andrew, I assume you want to pick that up along with the mm fix, right? Reviewed-by: Thomas Gleixner