Hi,
just for completeness, here is a re-post of the complete patch using
cleanerd->c_running instead of local variable "sleeping".
Bye,
David Arendt
On 03/17/10 19:11, Ryusuke Konishi wrote:
> Hi,
> On Mon, 15 Mar 2010 22:24:28 +0100, David Arendt wrote:
>
>> Hi,
>>
>> Well I didn't know that a few days can pass as fast :-)
>>
>> I have attached the patch to this mail.
>>
>> Until now the patch has only been shortly tested on a loop device, so it
>> might contain bugs and destroy your data.
>>
> Thank you for posting the patch!
>
> The patch looks rougly ok to me.
> I'll comment on it later.
>
> At first glance, I felt it would be nice if cleanerd->c_running is
> nicely used instead of adding a local variable "sleeping".
>
> Thanks,
> Ryusuke Konishi
>
>
>> If you decide to apply it, please change the default values to the ones
>> you find the most appropriate.
>>
>> Thanks in advance,
>> Bye,
>> David Arendt
>>
>> On 03/15/10 16:58, Ryusuke Konishi wrote:
>>
>>> Hi,
>>> On Mon, 15 Mar 2010 00:03:45 +0100, David Arendt wrote:
>>>
>>>
>>>> Hi,
>>>>
>>>> I am posting this again to the correct mailing list as I cc'ed it to the
>>>> old inactive one.
>>>>
>>>> Maybe I am understanding something wrong, but if I would use the count
>>>> of reclaimed segments, how could I determine if one cleaning pass has
>>>> finished as I don't know in advance how many segments could be reclaimed ?
>>>>
>>>>
>>> For example, how about this?
>>>
>>> nmax = (number of segments) - (number of clean segments)
>>> nblk = (max_clean_segments - (number of clean segments)) *
>>> (number of blocks per segment)
>>>
>>> * If (number of clean segments) < min_clean_segments, then start
>>> reclamation
>>> * Try to reclaim nmax segments (at a maximum).
>>> * When the cleaner found and freed nblk blocks during the
>>> reclamation, then end one cleaning pass.
>>>
>>>
>>>
>>>> Another approach would be not basing cleaning on a whole cleaning pass
>>>> but instead creating these addtional configfile options:
>>>>
>>>> # start cleaning if less than 100 free segments
>>>> min_clean_segments 100
>>>>
>>>> # stop cleaning if more than 200 free segments
>>>> max_clean_segments 200
>>>>
>>>> # check free space once an hour
>>>> segment_check_interval 3600
>>>>
>>>> Basically in this example if less than 800mb are free cleaner is run
>>>> until 1600mb are free. If min_clean_segments is 0, the cleaner would do
>>>> normal operation.
>>>>
>>>>
>>> The first two parameters look Ok.
>>> (I've already referred to these in the above example.)
>>>
>>> We may well be able to make segment_check_interval more frequent.
>>> or do you have something in mind?
>>>
>>> Do you mean interval of cleaning passes ?
>>>
>>>
>>>
>>>> For this solution only changes in configfile loading and
>>>> nilfs_cleanerd_clean_loop would be necessary which would lower the risk
>>>> of introducing new bugs.
>>>>
>>>> If this solution is ok for you, I will implement it this way and send
>>>> you the patch in a few days. Also tell me if the names I have choosen
>>>> for the options are ok for you or if you would prefer other ones.
>>>>
>>>>
>>> The option names look fine to me.
>>> Or should we use percentage for them?
>>> (number of segments is device dependent)
>>>
>>> Is there anything else that isn't clear?
>>>
>>>
>>>
>>>> Thanks in advance
>>>> Bye,
>>>> David Arendt
>>>>
>>>>
>>> Thanks,
>>> Ryusuke Konishi
>>>
>>>
>>>
>>>> On 03/14/10 15:28, Ryusuke Konishi wrote:
>>>>
>>>>
>>>>> Hi,
>>>>> On Sun, 14 Mar 2010 14:00:19 +0100, [email protected] wrote:
>>>>>
>>>>>
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I will try to implement this myself then. Concerning the
>>>>>> nilfs_cleanerd_select segments function I was unclear in my post. In
>>>>>> fact I did not mean the return value but the first element from the
>>>>>> segnums array.
>>>>>>
>>>>>>
>>>>>>
>>>>> Ok. So you thought of determining termination of one cleaning pass by
>>>>> the segment number stored preliminarily.
>>>>>
>>>>> Why not just use count of processed (i.e. reclaimed) segments?
>>>>>
>>>>> Note that it's not guranteed that segments are selected in the order
>>>>> of segment number though this premise looks almost right.
>>>>>
>>>>> It depends on the behavior of segment allocator and the current
>>>>> "Select-oldest" algorithm used behind
>>>>> nilfs_cleanerd_select_segments(). Nilfs log writer occasionally
>>>>> behaves differently and disturbs this order.
>>>>>
>>>>> I think you can ignore the exceptional behavior of the segment
>>>>> allocator, and rotate target segments with skipping free or mostly
>>>>> in-use ones. In that case, nilfs_cleanerd_select_segments() should be
>>>>> modified to select segments in the order of segment number.
>>>>>
>>>>> Cheers,
>>>>> Ryusuke Konishi
>>>>>
>>>>>
>>>>>
>>>>>
>>>> --
>>>> To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in
>>>> the body of a message to [email protected]
>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>>>
>>>>
>>
diff -ur nilfs2-utils.orig/man/nilfs_cleanerd.conf.5
nilfs2-utils/man/nilfs_cleanerd.conf.5
--- nilfs2-utils.orig/man/nilfs_cleanerd.conf.5 2010-03-14 15:11:30.916690347
+0100
+++ nilfs2-utils/man/nilfs_cleanerd.conf.5 2010-03-15 22:15:58.320507660
+0100
@@ -25,6 +25,23 @@
and their blocks whose duration time is less than the value. The
default value is 3600, meaning one hour.
.TP
+.B min_clean_segments
+Specify the minimum number of clean segments. A value of 0 means
+normal cleaner operation. A value greater than 0 means pause cleaning
+until less than min_clean_segments are available. The default value
+is 100.
+.TP
+.B max_clean_segments
+Specify the maximum number of clean segments. If min_clean_segments is
+0, this value is ignored. If more than max_clean_segments are available
+cleaning is paused until less than min_clean_segments are available.
+The default value is 200.
+.TP
+.B clean_check_interval
+Specify the interval to wait between checks of min_clean_segments.
+If min_clean_segments is 0, this value is ignored.
+The default value is 60.
+.TP
.B selection_policy
Specify the GC policy. At present, only the `\fBtimestamp\fP' policy,
which reclaims segments in order from oldest to newest, is support.
diff -ur nilfs2-utils.orig/sbin/cleanerd/cldconfig.c
nilfs2-utils/sbin/cleanerd/cldconfig.c
--- nilfs2-utils.orig/sbin/cleanerd/cldconfig.c 2010-03-14 15:11:30.916690347
+0100
+++ nilfs2-utils/sbin/cleanerd/cldconfig.c 2010-03-15 20:20:22.364435601
+0100
@@ -90,6 +90,87 @@
return 0;
}
+static int
+nilfs_cldconfig_handle_min_clean_segments(struct nilfs_cldconfig *config,
+ char **tokens, size_t ntoks)
+{
+ __u64 n;
+ char *endptr;
+
+ if (check_tokens(tokens, ntoks, 2, 2) < 0)
+ return 0;
+
+ errno = 0;
+ n = strtoull(tokens[1], &endptr, 10);
+ if (*endptr != '\0') {
+ syslog(LOG_WARNING, "%s: %s: not a number",
+ tokens[0], tokens[1]);
+ return 0;
+ }
+ if ((n == ULLONG_MAX) && (errno == ERANGE)) {
+ syslog(LOG_WARNING, "%s: %s: number too large",
+ tokens[0], tokens[1]);
+ return 0;
+ }
+
+ config->cf_min_clean_segments = n;
+ return 0;
+}
+
+static int
+nilfs_cldconfig_handle_max_clean_segments(struct nilfs_cldconfig *config,
+ char **tokens, size_t ntoks)
+{
+ __u64 n;
+ char *endptr;
+
+ if (check_tokens(tokens, ntoks, 2, 2) < 0)
+ return 0;
+
+ errno = 0;
+ n = strtoull(tokens[1], &endptr, 10);
+ if (*endptr != '\0') {
+ syslog(LOG_WARNING, "%s: %s: not a number",
+ tokens[0], tokens[1]);
+ return 0;
+ }
+ if ((n == ULLONG_MAX) && (errno == ERANGE)) {
+ syslog(LOG_WARNING, "%s: %s: number too large",
+ tokens[0], tokens[1]);
+ return 0;
+ }
+
+ config->cf_max_clean_segments = n;
+ return 0;
+}
+
+static int
+nilfs_cldconfig_handle_clean_check_interval(struct nilfs_cldconfig *config,
+ char **tokens, size_t ntoks)
+{
+ time_t period;
+ char *endptr;
+
+ if (check_tokens(tokens, ntoks, 2, 2) < 0)
+ return 0;
+
+ errno = 0;
+ period = strtoul(tokens[1], &endptr, 10);
+ if (*endptr != '\0') {
+ syslog(LOG_WARNING, "%s: %s: not a number",
+ tokens[0], tokens[1]);
+ return 0;
+ }
+ if ((period == ULONG_MAX) && (errno == ERANGE)) {
+ syslog(LOG_WARNING, "%s: %s: number too large",
+ tokens[0], tokens[1]);
+ return 0;
+ }
+
+ config->cf_clean_check_interval = period;
+ return 0;
+}
+
static unsigned long long
nilfs_cldconfig_selection_policy_timestamp(const struct nilfs_suinfo *si)
{
@@ -277,6 +358,9 @@
static const struct nilfs_cldconfig_keyword
nilfs_cldconfig_keyword_table[] = {
{"protection_period", nilfs_cldconfig_handle_protection_period},
+ {"min_clean_segments", nilfs_cldconfig_handle_min_clean_segments},
+ {"max_clean_segments", nilfs_cldconfig_handle_max_clean_segments},
+ {"clean_check_interval",nilfs_cldconfig_handle_clean_check_interval},
{"selection_policy", nilfs_cldconfig_handle_selection_policy},
{"nsegments_per_clean", nilfs_cldconfig_handle_nsegments_per_clean},
{"cleaning_interval", nilfs_cldconfig_handle_cleaning_interval},
@@ -313,6 +397,9 @@
config->cf_selection_policy.p_threshold =
NILFS_CLDCONFIG_SELECTION_POLICY_THRESHOLD;
config->cf_protection_period = NILFS_CLDCONFIG_PROTECTION_PERIOD;
+ config->cf_min_clean_segments = NILFS_CLDCONFIG_MIN_CLEAN_SEGMENTS;
+ config->cf_max_clean_segments = NILFS_CLDCONFIG_MAX_CLEAN_SEGMENTS;
+ config->cf_clean_check_interval = NILFS_CLDCONFIG_CLEAN_CHECK_INTERVAL;
config->cf_nsegments_per_clean = NILFS_CLDCONFIG_NSEGMENTS_PER_CLEAN;
config->cf_cleaning_interval = NILFS_CLDCONFIG_CLEANING_INTERVAL;
config->cf_retry_interval = NILFS_CLDCONFIG_RETRY_INTERVAL;
diff -ur nilfs2-utils.orig/sbin/cleanerd/cldconfig.h
nilfs2-utils/sbin/cleanerd/cldconfig.h
--- nilfs2-utils.orig/sbin/cleanerd/cldconfig.h 2010-03-14 15:11:30.916690347
+0100
+++ nilfs2-utils/sbin/cleanerd/cldconfig.h 2010-03-15 21:58:16.208614224
+0100
@@ -42,6 +42,9 @@
* struct nilfs_cldconfig -
* @cf_selection_policy:
* @cf_protection_period:
+ * @cf_min_clean_segments:
+ * @cf_max_clean_segments:
+ * @cf_clean_check_interval:
* @cf_nsegments_per_clean
* @cf_cleaning_interval:
* @cf_use_mmap:
@@ -50,6 +53,9 @@
struct nilfs_cldconfig {
struct nilfs_selection_policy cf_selection_policy;
time_t cf_protection_period;
+ __u64 cf_min_clean_segments;
+ __u64 cf_max_clean_segments;
+ time_t cf_clean_check_interval;
int cf_nsegments_per_clean;
time_t cf_cleaning_interval;
time_t cf_retry_interval;
@@ -61,6 +67,9 @@
nilfs_cldconfig_selection_policy_timestamp
#define NILFS_CLDCONFIG_SELECTION_POLICY_THRESHOLD 0
#define NILFS_CLDCONFIG_PROTECTION_PERIOD 3600
+#define NILFS_CLDCONFIG_MIN_CLEAN_SEGMENTS 100
+#define NILFS_CLDCONFIG_MAX_CLEAN_SEGMENTS 200
+#define NILFS_CLDCONFIG_CLEAN_CHECK_INTERVAL 60
#define NILFS_CLDCONFIG_NSEGMENTS_PER_CLEAN 2
#define NILFS_CLDCONFIG_CLEANING_INTERVAL 5
#define NILFS_CLDCONFIG_RETRY_INTERVAL 60
diff -ur nilfs2-utils.orig/sbin/cleanerd/cleanerd.c
nilfs2-utils/sbin/cleanerd/cleanerd.c
--- nilfs2-utils.orig/sbin/cleanerd/cleanerd.c 2010-03-14 15:11:30.916690347
+0100
+++ nilfs2-utils/sbin/cleanerd/cleanerd.c 2010-03-17 19:59:36.845402863
+0100
@@ -1198,9 +1198,17 @@
if (ret < 0)
return -1;
- cleanerd->c_running = 1;
cleanerd->c_ncleansegs = cleanerd->c_config.cf_nsegments_per_clean;
+ if (cleanerd->c_config.cf_min_clean_segments > 0) {
+ syslog(LOG_INFO, "cleaner paused");
+ cleanerd->c_running = 0;
+ timeout.tv_sec = cleanerd->c_config.cf_clean_check_interval;
+ timeout.tv_nsec = 0;
+ }
+ else
+ cleanerd->c_running = 1;
+
while (1) {
if (sigprocmask(SIG_BLOCK, &sigset, NULL) < 0) {
syslog(LOG_ERR, "cannot set signal mask: %m");
@@ -1220,10 +1228,32 @@
syslog(LOG_ERR, "cannot get segment usage stat: %m");
return -1;
}
+
+ if (cleanerd->c_config.cf_min_clean_segments > 0) {
+ if (cleanerd->c_running) {
+ if (sustat.ss_ncleansegs >
cleanerd->c_config.cf_max_clean_segments) {
+ syslog(LOG_INFO, "cleaner paused");
+ cleanerd->c_running = 0;
+ timeout.tv_sec =
cleanerd->c_config.cf_clean_check_interval;
+ timeout.tv_nsec = 0;
+ goto sleep;
+ }
+ }
+ else {
+ if (sustat.ss_ncleansegs <
cleanerd->c_config.cf_min_clean_segments) {
+ syslog(LOG_INFO, "cleaner resumed");
+ cleanerd->c_running = 1;
+ }
+ else
+ goto sleep;
+ }
+ }
+
if (sustat.ss_nongc_ctime != prev_nongc_ctime) {
cleanerd->c_running = 1;
prev_nongc_ctime = sustat.ss_nongc_ctime;
}
+
if (!cleanerd->c_running)
goto sleep;
diff -ur nilfs2-utils.orig/sbin/cleanerd/nilfs_cleanerd.conf
nilfs2-utils/sbin/cleanerd/nilfs_cleanerd.conf
--- nilfs2-utils.orig/sbin/cleanerd/nilfs_cleanerd.conf 2010-03-14
15:11:30.916690347 +0100
+++ nilfs2-utils/sbin/cleanerd/nilfs_cleanerd.conf 2010-03-15
21:44:02.995587453 +0100
@@ -7,6 +7,17 @@
# Protection period in second.
protection_period 3600
+# Minium number of clean segements
+# 0 = normal cleaner behaviour
+# >0 = start cleaning if less segments are available
+min_clean_segments 100
+
+# Maximum number of clean segments
+max_clean_segments 200
+
+# Clean segment check interval in seconds
+clean_check_interval 60
+
# Segment selection policy.
# In NILFS version 2.0.0, only the timestamp policy is supported.
selection_policy timestamp # timestamp in ascend order
