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Wed, 21 Oct 2026 09:24:58 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id FcqZKOqE2GpuEAAAD6G6ig (envelope-from ); Wed, 21 Oct 2026 09:24:58 +0000 Message-ID: Date: Wed, 21 Oct 2026 11:24:41 +0200 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/3] dm zoned: back off when reclaim finds no destination zone To: Kyrylo Biryuk , dm-devel@lists.linux.dev Cc: agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, bmarzins@redhat.com, dlemoal@kernel.org, linux-kernel@vger.kernel.org References: <20261011175450.952-1-illofspeed@gmail.com> <20261011175450.952-2-illofspeed@gmail.com> Content-Language: en-US From: Hannes Reinecke In-Reply-To: <20261011175450.952-2-illofspeed@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-4.29 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; XM_UA_NO_VERSION(0.01)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; ARC_NA(0.00)[]; FREEMAIL_TO(0.00)[gmail.com,lists.linux.dev]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; RCVD_TLS_ALL(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; RCPT_COUNT_SEVEN(0.00)[8]; MID_RHS_MATCH_FROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:email] X-Spam-Score: -4.29 X-Spam-Level: X-Spam-Flag: NO On 10/11/26 7:54 PM, Kyrylo Biryuk wrote: > When dmz_do_reclaim() fails with -ENOSPC because no free zone is > available to copy the data into, dmz_reclaim_work() still ends with > dmz_schedule_reclaim(). If the target is idle, dmz_should_reclaim() > keeps returning true, the work is queued again with no delay and the > worker spins on the same failing pass. > > Re-arm the idle poll instead, so that reclaim is retried after > DMZ_IDLE_PERIOD. The next patch makes -ENOSPC the expected result when > an idle target has random zones but no free sequential zone. > > Tested on a 7.2.6 kernel as an out-of-tree dm-zoned module, together > with the next two patches, on emulated host-managed drives (tcmu-runner > ZBC handler) and on three 27 TB host-managed drives used as md RAID5 > members. > > Assisted-by: LLM > Signed-off-by: Kyrylo Biryuk > --- > drivers/md/dm-zoned-reclaim.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c > index c041413c729..315f0da99f3 100644 > --- a/drivers/md/dm-zoned-reclaim.c > +++ b/drivers/md/dm-zoned-reclaim.c > @@ -540,6 +540,14 @@ static void dmz_reclaim_work(struct work_struct *work) > if (ret && ret != -EINTR) { > if (!dmz_check_dev(zmd)) > return; > + if (ret == -ENOSPC) { > + /* > + * No zone to copy into: nothing can progress now. > + * Rescheduling immediately would spin; poll instead. > + */ > + mod_delayed_work(zrc->wq, &zrc->work, DMZ_IDLE_PERIOD); > + return; > + } > } > > dmz_schedule_reclaim(zrc); Reviewed-by: Hannes Reinecke Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@suse.de +49 911 74053 688 SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich