Messages in this thread | | | Date | Tue, 3 Oct 2017 13:17:37 -0700 | From | Jaegeuk Kim <> | Subject | Re: [f2fs-dev] [PATCH v4] f2fs: introduce discard_granularity sysfs entry |
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On 10/04, Ju Hyung Park wrote: > Hi Chao. > > Yep, that patch seems to have fixed it. > Doing "while true; do fstrim -v /; done" while "rm -rf"ing a 2GB > kbuild directory > (with lots of small .o files and stuff) ended flawlessly. > > I hope to see this patch merged with next 4.14 merge cycle.
Cool! I'll merge this patch and submit for 4.14. :)
Thanks,
> > Thanks :) > > On Tue, Oct 3, 2017 at 12:59 AM, Chao Yu <chao@kernel.org> wrote: > > Hi Park, > > > > Thanks for the report, could have a try with below patch: > > > > From 5fa30e8cdcb93f210e25142c48a884be383c6121 Mon Sep 17 00:00:00 2001 > > From: Chao Yu <yuchao0@huawei.com> > > Date: Mon, 2 Oct 2017 02:50:16 +0800 > > Subject: [PATCH] f2fs: fix potential panic during fstrim > > > > As Ju Hyung Park reported: > > > > "When 'fstrim' is called for manual trim, a BUG() can be triggered > > randomly with this patch. > > > > I'm seeing this issue on both x86 Desktop and arm64 Android phone. > > > > On x86 Desktop, this was caused during Ubuntu boot-up. I have a > > cronjob installed which calls 'fstrim -v /' during boot. On arm64 > > Android, this was caused during GC looping with 1ms gc_min_sleep_time > > & gc_max_sleep_time." > > > > Root cause of this issue is that f2fs_wait_discard_bios can only be > > used by f2fs_put_super, because during put_super there must be no > > other referrers, so it can ignore discard entry's reference count > > when removing the entry, otherwise in other caller we will hit bug_on > > in __remove_discard_cmd as there may be other issuer added reference > > count in discard entry. > > > > Thread A Thread B > > - issue_discard_thread > > - f2fs_ioc_fitrim > > - f2fs_trim_fs > > - f2fs_wait_discard_bios > > - __issue_discard_cmd > > - __submit_discard_cmd > > - __wait_discard_cmd > > - dc->ref++ > > - __wait_one_discard_bio > > - __wait_discard_cmd > > - __remove_discard_cmd > > - f2fs_bug_on(sbi, dc->ref) > > > > Fixes: 969d1b180d987c2be02de890d0fff0f66a0e80de > > Reported-by: Ju Hyung Park <qkrwngud825@gmail.com> > > Signed-off-by: Chao Yu <yuchao0@huawei.com> > > --- > > fs/f2fs/f2fs.h | 2 +- > > fs/f2fs/segment.c | 6 +++--- > > fs/f2fs/super.c | 2 +- > > 3 files changed, 5 insertions(+), 5 deletions(-) > > > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > > index 9a7c90386947..4b4a72f392be 100644 > > --- a/fs/f2fs/f2fs.h > > +++ b/fs/f2fs/f2fs.h > > @@ -2525,7 +2525,7 @@ void invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr); > > bool is_checkpointed_data(struct f2fs_sb_info *sbi, block_t blkaddr); > > void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old, block_t new); > > void stop_discard_thread(struct f2fs_sb_info *sbi); > > -void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi); > > +void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi, bool umount); > > void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc); > > void release_discard_addrs(struct f2fs_sb_info *sbi); > > int npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra); > > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c > > index dedf0209d820..e28245b7e44e 100644 > > --- a/fs/f2fs/segment.c > > +++ b/fs/f2fs/segment.c > > @@ -1210,11 +1210,11 @@ void stop_discard_thread(struct f2fs_sb_info *sbi) > > } > > > > /* This comes from f2fs_put_super and f2fs_trim_fs */ > > -void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi) > > +void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi, bool umount) > > { > > __issue_discard_cmd(sbi, false); > > __drop_discard_cmd(sbi); > > - __wait_discard_cmd(sbi, false); > > + __wait_discard_cmd(sbi, !umount); > > } > > > > static void mark_discard_range_all(struct f2fs_sb_info *sbi) > > @@ -2244,7 +2244,7 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range) > > } > > /* It's time to issue all the filed discards */ > > mark_discard_range_all(sbi); > > - f2fs_wait_discard_bios(sbi); > > + f2fs_wait_discard_bios(sbi, false); > > out: > > range->len = F2FS_BLK_TO_BYTES(cpc.trimmed); > > return err; > > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c > > index 89f61eb3d167..933c3d529e65 100644 > > --- a/fs/f2fs/super.c > > +++ b/fs/f2fs/super.c > > @@ -801,7 +801,7 @@ static void f2fs_put_super(struct super_block *sb) > > } > > > > /* be sure to wait for any on-going discard commands */ > > - f2fs_wait_discard_bios(sbi); > > + f2fs_wait_discard_bios(sbi, true); > > > > if (f2fs_discard_en(sbi) && !sbi->discard_blks) { > > struct cp_control cpc = { > > -- > > 2.14.1.145.gb3622a4ee > > > > On 2017/10/2 3:29, Ju Hyung Park wrote: > >> When 'fstrim' is called for manual trim, a BUG() can be triggered > >> randomly with this patch. > >> > >> I'm seeing this issue on both x86 Desktop and arm64 Android phone. > >> > >> On x86 Desktop, this was caused during Ubuntu boot-up. I have a > >> cronjob installed > >> which calls 'fstrim -v /' during boot. > >> On arm64 Android, this was caused during GC looping with > >> 1ms gc_min_sleep_time & gc_max_sleep_time. > >> > >> Thanks. > >> > >> [26671.666421] ------------[ cut here ]------------ > >> [26671.666426] WARNING: CPU: 8 PID: 103479 at fs/f2fs/segment.c:797 > >> __remove_discard_cmd+0xb9/0xd0 > >> [26671.666427] Modules linked in: ftdi_sio usbserial uas usb_storage > >> vmnet(O) vmw_vsock_vmci_transport vsock vmw_vmci vmmon(O) rfcomm > >> xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 > >> iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 > >> xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge > >> stp llc bnep ebtable_filter ebtables ip6table_filter ip6_tables > >> xt_multiport iptable_filter binfmt_misc snd_hda_codec_hdmi eeepc_wmi > >> asus_wmi sparse_keymap video wmi_bmof mxm_wmi nls_iso8859_1 btusb > >> btrtl joydev btbcm btintel input_leds bluetooth edac_mce_amd > >> snd_hda_codec_realtek snd_hda_codec_generic kvm_amd kvm irqbypass > >> snd_seq_dummy snd_hda_intel snd_hda_codec snd_seq_oss snd_seq_midi > >> snd_hda_core snd_seq_midi_event snd_hwdep snd_pcm snd_rawmidi snd_seq > >> snd_seq_device > >> [26671.666450] snd_timer snd soundcore k10temp i2c_piix4 > >> nvidia_uvm(PO) shpchp wmi 8250_dw mac_hid parport_pc ppdev nfsd lp > >> auth_rpcgss parport oid_registry nfs_acl lockd grace sunrpc ip_tables > >> x_tables autofs4 raid10 raid456 async_raid6_recov async_memcpy > >> async_pq async_xor async_tx raid1 multipath linear hid_generic > >> hid_apple usbhid nvidia_drm(PO) nvidia_modeset(PO) nvidia(PO) > >> drm_kms_helper syscopyarea sysfillrect sysimgblt igb fb_sys_fops dca > >> ptp drm pps_core i2c_algo_bit ahci libahci gpio_amdpt gpio_generic > >> [26671.666471] CPU: 8 PID: 103479 Comm: fstrim Tainted: P O > >> 4.13.4-zen+ #1 > >> [26671.666472] Hardware name: System manufacturer System Product > >> Name/PRIME X399-A, BIOS 0318 08/11/2017 > >> [26671.666472] task: ffff8804ad535800 task.stack: ffff88047ee38000 > >> [26671.666474] RIP: 0010:__remove_discard_cmd+0xb9/0xd0 > >> [26671.666474] RSP: 0018:ffff88047ee3bd00 EFLAGS: 00010202 > >> [26671.666475] RAX: ffff88081801a500 RBX: ffff88047eeaed00 RCX: ffff88047eeaedf8 > >> [26671.666475] RDX: 0000000000000001 RSI: ffff88047eeaed00 RDI: ffff880802555800 > >> [26671.666476] RBP: ffff8808134d0000 R08: ffff8804ad535800 R09: 0000000000000001 > >> [26671.666476] R10: ffff88047ee3bd18 R11: 0000000000000000 R12: ffff880802555800 > >> [26671.666476] R13: 0000000000000000 R14: ffff88047eeaedd0 R15: ffff8808134d0000 > >> [26671.666477] FS: 00007f44cddad2c0(0000) GS:ffff88081ca00000(0000) > >> knlGS:0000000000000000 > >> [26671.666478] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > >> [26671.666478] CR2: 00007f88f5776328 CR3: 000000058ce4a000 CR4: 00000000003406e0 > >> [26671.666479] Call Trace: > >> [26671.666481] ? __wait_discard_cmd+0x7a/0xc0 > >> [26671.666482] ? f2fs_trim_fs+0x1c1/0x210 > >> [26671.666484] ? f2fs_ioctl+0x75a/0x2320 > >> [26671.666486] ? do_filp_open+0x99/0xe0 > >> [26671.666487] ? cp_new_stat+0x138/0x150 > >> [26671.666489] ? do_vfs_ioctl+0x88/0x5c0 > >> [26671.666490] ? SyS_newfstat+0x29/0x40 > >> [26671.666491] ? SyS_ioctl+0x6f/0x80 > >> [26671.666493] ? entry_SYSCALL_64_fastpath+0x1e/0xa9 > >> [26671.666493] Code: 48 89 de 8b 43 1c 48 8b 3d 4d 8c 31 01 29 85 74 > >> 22 00 00 e8 fa 01 d5 ff f0 ff 8d 80 22 00 00 5b 5d c3 c7 43 64 00 00 > >> 00 00 eb 92 <0f> ff f0 80 4f 20 04 e9 53 ff ff ff 90 66 2e 0f 1f 84 00 > >> 00 00 > >> [26671.666506] ---[ end trace 613553f7a4728b5a ]--- > >> [26672.553742] general protection fault: 0000 [#1] PREEMPT SMP > >> [26672.553746] Modules linked in: ftdi_sio usbserial uas usb_storage > >> vmnet(O) vmw_vsock_vmci_transport vsock vmw_vmci vmmon(O) rfcomm > >> xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 > >> iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 > >> xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge > >> stp llc bnep ebtable_filter ebtables ip6table_filter ip6_tables > >> xt_multiport iptable_filter binfmt_misc snd_hda_codec_hdmi eeepc_wmi > >> asus_wmi sparse_keymap video wmi_bmof mxm_wmi nls_iso8859_1 btusb > >> btrtl joydev btbcm btintel input_leds bluetooth edac_mce_amd > >> snd_hda_codec_realtek snd_hda_codec_generic kvm_amd kvm irqbypass > >> snd_seq_dummy snd_hda_intel snd_hda_codec snd_seq_oss snd_seq_midi > >> snd_hda_core snd_seq_midi_event snd_hwdep snd_pcm snd_rawmidi snd_seq > >> snd_seq_device > >> [26672.553771] snd_timer snd soundcore k10temp i2c_piix4 > >> nvidia_uvm(PO) shpchp wmi 8250_dw mac_hid parport_pc ppdev nfsd lp > >> auth_rpcgss parport oid_registry nfs_acl lockd grace sunrpc ip_tables > >> x_tables autofs4 raid10 raid456 async_raid6_recov async_memcpy > >> async_pq async_xor async_tx raid1 multipath linear hid_generic > >> hid_apple usbhid nvidia_drm(PO) nvidia_modeset(PO) nvidia(PO) > >> drm_kms_helper syscopyarea sysfillrect sysimgblt igb fb_sys_fops dca > >> ptp drm pps_core i2c_algo_bit ahci libahci gpio_amdpt gpio_generic > >> [26672.553792] CPU: 10 PID: 1287 Comm: f2fs_discard-25 Tainted: P > >> W O 4.13.4-zen+ #1 > >> [26672.553793] Hardware name: System manufacturer System Product > >> Name/PRIME X399-A, BIOS 0318 08/11/2017 > >> [26672.553794] task: ffff8808159c1600 task.stack: ffff880813304000 > >> [26672.553798] RIP: 0010:__remove_discard_cmd+0x6a/0xd0 > >> [26672.553799] RSP: 0018:ffff880813307e20 EFLAGS: 00010296 > >> [26672.553800] RAX: dead000000000200 RBX: ffff88047eeaed00 RCX: ffff8808159c1601 > >> [26672.553801] RDX: dead000000000100 RSI: ffff8808134d2288 RDI: ffff88047eeaed00 > >> [26672.553801] RBP: ffff8808134d0000 R08: 0000184230172c00 R09: 0000000000000006 > >> [26672.553802] R10: ffff880813307e38 R11: 0000000000000023 R12: ffff880802555800 > >> [26672.553803] R13: 0000000000000001 R14: ffff88047eeaed00 R15: ffff8808134d0000 > >> [26672.553804] FS: 0000000000000000(0000) GS:ffff88081ca80000(0000) > >> knlGS:0000000000000000 > >> [26672.553805] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > >> [26672.553805] CR2: 00007f88f2f71328 CR3: 000000048be79000 CR4: 00000000003406e0 > >> [26672.553806] Call Trace: > >> [26672.553808] ? __wait_one_discard_bio+0x41/0x60 > >> [26672.553809] ? __wait_discard_cmd+0xbb/0xc0 > >> [26672.553811] ? issue_discard_thread+0x196/0x200 > >> [26672.553813] ? wait_woken+0x80/0x80 > >> [26672.553814] ? mark_discard_range_all.isra.11+0x40/0x40 > >> [26672.553816] ? kthread+0x112/0x130 > >> [26672.553817] ? kthread_create_on_node+0x40/0x40 > >> [26672.553818] ? do_group_exit+0x2e/0xa0 > >> [26672.553820] ? ret_from_fork+0x25/0x30 > >> [26672.553821] Code: 8b 43 20 48 8b 3f e8 56 6c fe ff 58 80 7b 62 02 > >> 75 07 f0 ff 8d 7c 22 00 00 48 8b 53 28 48 8b 43 30 48 8d b5 88 22 00 > >> 00 48 89 df <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 > >> 43 28 > >> [26672.553835] RIP: __remove_discard_cmd+0x6a/0xd0 RSP: ffff880813307e20 > >> [26672.553836] ---[ end trace 613553f7a4728b5b ]--- > >> > >> On Tue, Aug 22, 2017 at 5:42 AM, Jaegeuk Kim <jaegeuk@kernel.org> wrote: > >>> On 08/18, Chao Yu wrote: > >>>> Hi Jaegeuk, > >>>> > >>>> Sorry for the delay, the modification looks good to me. ;) > >>> > >>> We must avoid waking up discard thread caused by # of pending commands > >>> which are never issued. > >>> > >>> From a73f8807248c2f42328a2204eab16a3b8d32c83e Mon Sep 17 00:00:00 2001 > >>> From: Chao Yu <yuchao0@huawei.com> > >>> Date: Mon, 7 Aug 2017 23:09:56 +0800 > >>> Subject: [PATCH] f2fs: introduce discard_granularity sysfs entry > >>> > >>> Commit d618ebaf0aa8 ("f2fs: enable small discard by default") enables > >>> f2fs to issue 4K size discard in real-time discard mode. However, issuing > >>> smaller discard may cost more lifetime but releasing less free space in > >>> flash device. Since f2fs has ability of separating hot/cold data and > >>> garbage collection, we can expect that small-sized invalid region would > >>> expand soon with OPU, deletion or garbage collection on valid datas, so > >>> it's better to delay or skip issuing smaller size discards, it could help > >>> to reduce overmuch consumption of IO bandwidth and lifetime of flash > >>> storage. > >>> > >>> This patch makes f2fs selectng 64K size as its default minimal > >>> granularity, and issue discard with the size which is not smaller than > >>> minimal granularity. Also it exposes discard granularity as sysfs entry > >>> for configuration in different scenario. > >>> > >>> Jaegeuk Kim: > >>> We must issue all the accumulated discard commands when fstrim is called. > >>> So, I've added pend_list_tag[] to indicate whether we should issue the > >>> commands or not. If tag sets P_ACTIVE or P_TRIM, we have to issue them. > >>> P_TRIM is set once at a time, given fstrim trigger. > >>> In addition, issue_discard_thread is calling too much due to the number of > >>> discard commands remaining in the pending list. I added a timer to control > >>> it likewise gc_thread. > >>> > >>> Signed-off-by: Chao Yu <yuchao0@huawei.com> > >>> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> > >>> --- > >>> Documentation/ABI/testing/sysfs-fs-f2fs | 9 ++++ > >>> fs/f2fs/f2fs.h | 12 +++++ > >>> fs/f2fs/segment.c | 91 ++++++++++++++++++++++++++++----- > >>> fs/f2fs/sysfs.c | 23 +++++++++ > >>> 4 files changed, 121 insertions(+), 14 deletions(-) > >>> > >>> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs > >>> index 621da3fc56c5..11b7f4ebea7c 100644 > >>> --- a/Documentation/ABI/testing/sysfs-fs-f2fs > >>> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs > >>> @@ -57,6 +57,15 @@ Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com> > >>> Description: > >>> Controls the issue rate of small discard commands. > >>> > >>> +What: /sys/fs/f2fs/<disk>/discard_granularity > >>> +Date: July 2017 > >>> +Contact: "Chao Yu" <yuchao0@huawei.com> > >>> +Description: > >>> + Controls discard granularity of inner discard thread, inner thread > >>> + will not issue discards with size that is smaller than granularity. > >>> + The unit size is one block, now only support configuring in range > >>> + of [1, 512]. > >>> + > >>> What: /sys/fs/f2fs/<disk>/max_victim_search > >>> Date: January 2014 > >>> Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com> > >>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > >>> index e252e5bf9791..4b993961d81d 100644 > >>> --- a/fs/f2fs/f2fs.h > >>> +++ b/fs/f2fs/f2fs.h > >>> @@ -148,6 +148,8 @@ enum { > >>> (BATCHED_TRIM_SEGMENTS(sbi) << (sbi)->log_blocks_per_seg) > >>> #define MAX_DISCARD_BLOCKS(sbi) BLKS_PER_SEC(sbi) > >>> #define DISCARD_ISSUE_RATE 8 > >>> +#define DEF_MIN_DISCARD_ISSUE_TIME 50 /* 50 ms, if exists */ > >>> +#define DEF_MAX_DISCARD_ISSUE_TIME 60000 /* 60 s, if no candidates */ > >>> #define DEF_CP_INTERVAL 60 /* 60 secs */ > >>> #define DEF_IDLE_INTERVAL 5 /* 5 secs */ > >>> > >>> @@ -196,11 +198,18 @@ struct discard_entry { > >>> unsigned char discard_map[SIT_VBLOCK_MAP_SIZE]; /* segment discard bitmap */ > >>> }; > >>> > >>> +/* default discard granularity of inner discard thread, unit: block count */ > >>> +#define DEFAULT_DISCARD_GRANULARITY 16 > >>> + > >>> /* max discard pend list number */ > >>> #define MAX_PLIST_NUM 512 > >>> #define plist_idx(blk_num) ((blk_num) >= MAX_PLIST_NUM ? \ > >>> (MAX_PLIST_NUM - 1) : (blk_num - 1)) > >>> > >>> +#define P_ACTIVE 0x01 > >>> +#define P_TRIM 0x02 > >>> +#define plist_issue(tag) (((tag) & P_ACTIVE) || ((tag) & P_TRIM)) > >>> + > >>> enum { > >>> D_PREP, > >>> D_SUBMIT, > >>> @@ -236,11 +245,14 @@ struct discard_cmd_control { > >>> struct task_struct *f2fs_issue_discard; /* discard thread */ > >>> struct list_head entry_list; /* 4KB discard entry list */ > >>> struct list_head pend_list[MAX_PLIST_NUM];/* store pending entries */ > >>> + unsigned char pend_list_tag[MAX_PLIST_NUM];/* tag for pending entries */ > >>> struct list_head wait_list; /* store on-flushing entries */ > >>> wait_queue_head_t discard_wait_queue; /* waiting queue for wake-up */ > >>> + unsigned int discard_wake; /* to wake up discard thread */ > >>> struct mutex cmd_lock; > >>> unsigned int nr_discards; /* # of discards in the list */ > >>> unsigned int max_discards; /* max. discards to be issued */ > >>> + unsigned int discard_granularity; /* discard granularity */ > >>> unsigned int undiscard_blks; /* # of undiscard blocks */ > >>> atomic_t issued_discard; /* # of issued discard */ > >>> atomic_t issing_discard; /* # of issing discard */ > >>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c > >>> index 05144b3a7f62..1387925a0d83 100644 > >>> --- a/fs/f2fs/segment.c > >>> +++ b/fs/f2fs/segment.c > >>> @@ -1016,32 +1016,65 @@ static int __queue_discard_cmd(struct f2fs_sb_info *sbi, > >>> return 0; > >>> } > >>> > >>> -static void __issue_discard_cmd(struct f2fs_sb_info *sbi, bool issue_cond) > >>> +static int __issue_discard_cmd(struct f2fs_sb_info *sbi, bool issue_cond) > >>> { > >>> struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info; > >>> struct list_head *pend_list; > >>> struct discard_cmd *dc, *tmp; > >>> struct blk_plug plug; > >>> - int i, iter = 0; > >>> + int iter = 0, issued = 0; > >>> + int i; > >>> > >>> mutex_lock(&dcc->cmd_lock); > >>> f2fs_bug_on(sbi, > >>> !__check_rb_tree_consistence(sbi, &dcc->root)); > >>> blk_start_plug(&plug); > >>> - for (i = MAX_PLIST_NUM - 1; i >= 0; i--) { > >>> + for (i = MAX_PLIST_NUM - 1; > >>> + i >= 0 && plist_issue(dcc->pend_list_tag[i]); i--) { > >>> pend_list = &dcc->pend_list[i]; > >>> list_for_each_entry_safe(dc, tmp, pend_list, list) { > >>> f2fs_bug_on(sbi, dc->state != D_PREP); > >>> > >>> - if (!issue_cond || is_idle(sbi)) > >>> + /* Hurry up to finish fstrim */ > >>> + if (dcc->pend_list_tag[i] & P_TRIM) { > >>> + __submit_discard_cmd(sbi, dc); > >>> + issued++; > >>> + continue; > >>> + } > >>> + > >>> + if (!issue_cond || is_idle(sbi)) { > >>> + issued++; > >>> __submit_discard_cmd(sbi, dc); > >>> + } > >>> if (issue_cond && iter++ > DISCARD_ISSUE_RATE) > >>> goto out; > >>> } > >>> + if (list_empty(pend_list) && dcc->pend_list_tag[i] & P_TRIM) > >>> + dcc->pend_list_tag[i] &= (~P_TRIM); > >>> } > >>> out: > >>> blk_finish_plug(&plug); > >>> mutex_unlock(&dcc->cmd_lock); > >>> + > >>> + return issued; > >>> +} > >>> + > >>> +static void __drop_discard_cmd(struct f2fs_sb_info *sbi) > >>> +{ > >>> + struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info; > >>> + struct list_head *pend_list; > >>> + struct discard_cmd *dc, *tmp; > >>> + int i; > >>> + > >>> + mutex_lock(&dcc->cmd_lock); > >>> + for (i = MAX_PLIST_NUM - 1; i >= 0; i--) { > >>> + pend_list = &dcc->pend_list[i]; > >>> + list_for_each_entry_safe(dc, tmp, pend_list, list) { > >>> + f2fs_bug_on(sbi, dc->state != D_PREP); > >>> + __remove_discard_cmd(sbi, dc); > >>> + } > >>> + } > >>> + mutex_unlock(&dcc->cmd_lock); > >>> } > >>> > >>> static void __wait_one_discard_bio(struct f2fs_sb_info *sbi, > >>> @@ -1126,34 +1159,56 @@ void stop_discard_thread(struct f2fs_sb_info *sbi) > >>> void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi) > >>> { > >>> __issue_discard_cmd(sbi, false); > >>> + __drop_discard_cmd(sbi); > >>> __wait_discard_cmd(sbi, false); > >>> } > >>> > >>> +static void mark_discard_range_all(struct f2fs_sb_info *sbi) > >>> +{ > >>> + struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info; > >>> + int i; > >>> + > >>> + mutex_lock(&dcc->cmd_lock); > >>> + for (i = 0; i < MAX_PLIST_NUM; i++) > >>> + dcc->pend_list_tag[i] |= P_TRIM; > >>> + mutex_unlock(&dcc->cmd_lock); > >>> +} > >>> + > >>> static int issue_discard_thread(void *data) > >>> { > >>> struct f2fs_sb_info *sbi = data; > >>> struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info; > >>> wait_queue_head_t *q = &dcc->discard_wait_queue; > >>> + unsigned int wait_ms = DEF_MIN_DISCARD_ISSUE_TIME; > >>> + int issued; > >>> > >>> set_freezable(); > >>> > >>> do { > >>> - wait_event_interruptible(*q, kthread_should_stop() || > >>> - freezing(current) || > >>> - atomic_read(&dcc->discard_cmd_cnt)); > >>> + wait_event_interruptible_timeout(*q, > >>> + kthread_should_stop() || freezing(current) || > >>> + dcc->discard_wake, > >>> + msecs_to_jiffies(wait_ms)); > >>> if (try_to_freeze()) > >>> continue; > >>> if (kthread_should_stop()) > >>> return 0; > >>> > >>> + if (dcc->discard_wake) > >>> + dcc->discard_wake = 0; > >>> + > >>> sb_start_intwrite(sbi->sb); > >>> > >>> - __issue_discard_cmd(sbi, true); > >>> - __wait_discard_cmd(sbi, true); > >>> + issued = __issue_discard_cmd(sbi, true); > >>> + if (issued) { > >>> + __wait_discard_cmd(sbi, true); > >>> + wait_ms = DEF_MIN_DISCARD_ISSUE_TIME; > >>> + } else { > >>> + wait_ms = DEF_MAX_DISCARD_ISSUE_TIME; > >>> + } > >>> > >>> sb_end_intwrite(sbi->sb); > >>> > >>> - congestion_wait(BLK_RW_SYNC, HZ/50); > >>> } while (!kthread_should_stop()); > >>> return 0; > >>> } > >>> @@ -1344,7 +1399,8 @@ static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi) > >>> > >>> void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc) > >>> { > >>> - struct list_head *head = &(SM_I(sbi)->dcc_info->entry_list); > >>> + struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info; > >>> + struct list_head *head = &dcc->entry_list; > >>> struct discard_entry *entry, *this; > >>> struct dirty_seglist_info *dirty_i = DIRTY_I(sbi); > >>> unsigned long *prefree_map = dirty_i->dirty_segmap[PRE]; > >>> @@ -1426,11 +1482,12 @@ void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc) > >>> goto find_next; > >>> > >>> list_del(&entry->list); > >>> - SM_I(sbi)->dcc_info->nr_discards -= total_len; > >>> + dcc->nr_discards -= total_len; > >>> kmem_cache_free(discard_entry_slab, entry); > >>> } > >>> > >>> - wake_up(&SM_I(sbi)->dcc_info->discard_wait_queue); > >>> + dcc->discard_wake = 1; > >>> + wake_up_interruptible_all(&dcc->discard_wait_queue); > >>> } > >>> > >>> static int create_discard_cmd_control(struct f2fs_sb_info *sbi) > >>> @@ -1448,9 +1505,13 @@ static int create_discard_cmd_control(struct f2fs_sb_info *sbi) > >>> if (!dcc) > >>> return -ENOMEM; > >>> > >>> + dcc->discard_granularity = DEFAULT_DISCARD_GRANULARITY; > >>> INIT_LIST_HEAD(&dcc->entry_list); > >>> - for (i = 0; i < MAX_PLIST_NUM; i++) > >>> + for (i = 0; i < MAX_PLIST_NUM; i++) { > >>> INIT_LIST_HEAD(&dcc->pend_list[i]); > >>> + if (i >= dcc->discard_granularity - 1) > >>> + dcc->pend_list_tag[i] |= P_ACTIVE; > >>> + } > >>> INIT_LIST_HEAD(&dcc->wait_list); > >>> mutex_init(&dcc->cmd_lock); > >>> atomic_set(&dcc->issued_discard, 0); > >>> @@ -2127,6 +2188,8 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range) > >>> > >>> schedule(); > >>> } > >>> + /* It's time to issue all the filed discards */ > >>> + mark_discard_range_all(sbi); > >>> out: > >>> range->len = F2FS_BLK_TO_BYTES(cpc.trimmed); > >>> return err; > >>> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c > >>> index c40e5d24df9f..4bcaa9059026 100644 > >>> --- a/fs/f2fs/sysfs.c > >>> +++ b/fs/f2fs/sysfs.c > >>> @@ -152,6 +152,27 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a, > >>> spin_unlock(&sbi->stat_lock); > >>> return count; > >>> } > >>> + > >>> + if (!strcmp(a->attr.name, "discard_granularity")) { > >>> + struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info; > >>> + int i; > >>> + > >>> + if (t == 0 || t > MAX_PLIST_NUM) > >>> + return -EINVAL; > >>> + if (t == *ui) > >>> + return count; > >>> + > >>> + mutex_lock(&dcc->cmd_lock); > >>> + for (i = 0; i < MAX_PLIST_NUM; i++) { > >>> + if (i >= t - 1) > >>> + dcc->pend_list_tag[i] |= P_ACTIVE; > >>> + else > >>> + dcc->pend_list_tag[i] &= (~P_ACTIVE); > >>> + } > >>> + mutex_unlock(&dcc->cmd_lock); > >>> + return count; > >>> + } > >>> + > >>> *ui = t; > >>> > >>> if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0) > >>> @@ -248,6 +269,7 @@ F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle); > >>> F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent, gc_urgent); > >>> F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments); > >>> F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards); > >>> +F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity); > >>> F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks); > >>> F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections); > >>> F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy); > >>> @@ -290,6 +312,7 @@ static struct attribute *f2fs_attrs[] = { > >>> ATTR_LIST(gc_urgent), > >>> ATTR_LIST(reclaim_segments), > >>> ATTR_LIST(max_small_discards), > >>> + ATTR_LIST(discard_granularity), > >>> ATTR_LIST(batched_trim_sections), > >>> ATTR_LIST(ipu_policy), > >>> ATTR_LIST(min_ipu_util), > >>> -- > >>> 2.14.0.rc1.383.gd1ce394fe2-goog > >>> > >>> > >>> ------------------------------------------------------------------------------ > >>> Check out the vibrant tech community on one of the world's most > >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot > >>> _______________________________________________ > >>> Linux-f2fs-devel mailing list > >>> Linux-f2fs-devel@lists.sourceforge.net > >>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
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