From 60f3ab3bd0a8a87fbba1a6ea569c18f2d4208f30 Mon Sep 17 00:00:00 2001 From: Florian Forster Date: Sat, 8 Jan 2011 16:57:56 +0100 Subject: [PATCH] swap plugin: Implement the "ReportByDevice" for Linux. --- src/collectd.conf.in | 4 + src/collectd.conf.pod | 8 +- src/swap.c | 336 ++++++++++++++++++++++++++++++++------------------ 3 files changed, 222 insertions(+), 126 deletions(-) diff --git a/src/collectd.conf.in b/src/collectd.conf.in index 32a7582c..f1101fcb 100644 --- a/src/collectd.conf.in +++ b/src/collectd.conf.in @@ -849,6 +849,10 @@ # # +# +# ReportByDevice false +# + # # # Instance "slabinfo" diff --git a/src/collectd.conf.pod b/src/collectd.conf.pod index b63f486b..36efacd3 100644 --- a/src/collectd.conf.pod +++ b/src/collectd.conf.pod @@ -4172,19 +4172,19 @@ L. Please see there for details. =head2 Plugin C The I collects information about used and available swap space. On -I, the following options are available: +I and I, the following options are available: =over 4 =item B B|B -Configures how to report physical swap devices. If set to B is used (the +Configures how to report physical swap devices. If set to B (the default), the summary over all swap devices is reported only, i.e. the globally used and available space over all devices. If B is configured, the used and available space of each device will be reported separately. -This option is only available if the I can use the L -mechanism under I. +This option is only available if the I can read C +(under Linux) or use the L mechanism (under I). =back diff --git a/src/swap.c b/src/swap.c index 629d1a1e..a20087dd 100644 --- a/src/swap.c +++ b/src/swap.c @@ -70,19 +70,13 @@ #define MAX(x,y) ((x) > (y) ? (x) : (y)) #if KERNEL_LINUX +# define SWAP_HAVE_CONFIG 1 /* No global variables */ /* #endif KERNEL_LINUX */ #elif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS +# define SWAP_HAVE_CONFIG 1 static derive_t pagesize; - -static const char *config_keys[] = -{ - "ReportByDevice" -}; -static int config_keys_num = STATIC_ARRAY_SIZE (config_keys); - -static _Bool report_by_device = 0; /* #endif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS */ #elif defined(VM_SWAPUSAGE) @@ -107,7 +101,34 @@ static perfstat_memory_total_t pmemory; # error "No applicable input method." #endif /* HAVE_LIBSTATGRAB */ -static int swap_init (void) +#if SWAP_HAVE_CONFIG +static const char *config_keys[] = +{ + "ReportByDevice" +}; +static int config_keys_num = STATIC_ARRAY_SIZE (config_keys); + +static _Bool report_by_device = 0; + +static int swap_config (const char *key, const char *value) /* {{{ */ +{ + if (strcasecmp ("ReportByDevice", key) == 0) + { + if (IS_TRUE (value)) + report_by_device = 1; + else + report_by_device = 0; + } + else + { + return (-1); + } + + return (0); +} /* }}} int swap_config */ +#endif /* SWAP_HAVE_CONFIG */ + +static int swap_init (void) /* {{{ */ { #if KERNEL_LINUX /* No init stuff */ @@ -152,102 +173,189 @@ static int swap_init (void) #endif /* HAVE_PERFSTAT */ return (0); -} +} /* }}} int swap_init */ -static void swap_submit_inst (const char *plugin_instance, /* {{{ */ - const char *type_instance, derive_t value, unsigned type) +static void swap_submit (const char *plugin_instance, /* {{{ */ + const char *type, const char *type_instance, + value_t value) { - value_t values[1]; value_list_t vl = VALUE_LIST_INIT; - switch (type) - { - case DS_TYPE_GAUGE: - values[0].gauge = (gauge_t) value; - sstrncpy (vl.type, "swap", sizeof (vl.type)); - break; - case DS_TYPE_DERIVE: - values[0].derive = value; - sstrncpy (vl.type, "swap_io", sizeof (vl.type)); - break; - default: - ERROR ("swap plugin: swap_submit called with wrong" - " type"); - } + assert (type != NULL); - vl.values = values; + vl.values = &value; vl.values_len = 1; sstrncpy (vl.host, hostname_g, sizeof (vl.host)); sstrncpy (vl.plugin, "swap", sizeof (vl.plugin)); if (plugin_instance != NULL) sstrncpy (vl.plugin_instance, plugin_instance, sizeof (vl.plugin_instance)); - sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance)); + sstrncpy (vl.type, type, sizeof (vl.type)); + if (type_instance != NULL) + sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance)); plugin_dispatch_values (&vl); } /* }}} void swap_submit_inst */ -static void swap_submit (const char *type_instance, derive_t value, unsigned type) +static void swap_submit_gauge (const char *plugin_instance, /* {{{ */ + const char *type_instance, gauge_t value) +{ + value_t v; + + v.gauge = value; + swap_submit (plugin_instance, "swap", type_instance, v); +} /* }}} void swap_submit_gauge */ + +static void swap_submit_derive (const char *plugin_instance, /* {{{ */ + const char *type_instance, derive_t value) { - swap_submit_inst (/* plugin instance = */ NULL, - type_instance, value, type); -} + value_t v; + + v.derive = value; + swap_submit (plugin_instance, "swap_io", type_instance, v); +} /* }}} void swap_submit_derive */ + #if KERNEL_LINUX -static int swap_read (void) /* {{{ */ +static int swap_read_separate (void) /* {{{ */ { FILE *fh; char buffer[1024]; - char *fields[8]; - int numfields; + fh = fopen ("/proc/swaps", "r"); + if (fh == NULL) + { + char errbuf[1024]; + WARNING ("swap plugin: fopen (/proc/swaps) failed: %s", + sstrerror (errno, errbuf, sizeof (errbuf))); + return (-1); + } + + while (fgets (buffer, sizeof (buffer), fh) != NULL) + { + char *fields[8]; + int numfields; + char *endptr; + + char path[PATH_MAX]; + gauge_t size; + gauge_t used; + gauge_t free; + + numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields)); + if (numfields != 5) + continue; + + sstrncpy (path, fields[0], sizeof (path)); + escape_slashes (path, sizeof (path)); + + errno = 0; + endptr = NULL; + size = strtod (fields[2], &endptr); + if ((endptr == fields[2]) || (errno != 0)) + continue; + + errno = 0; + endptr = NULL; + used = strtod (fields[3], &endptr); + if ((endptr == fields[3]) || (errno != 0)) + continue; + + if (size < used) + continue; + + free = size - used; + + swap_submit_gauge (path, "used", used); + swap_submit_gauge (path, "free", free); + } - _Bool old_kernel=0; + fclose (fh); - derive_t swap_used = 0; - derive_t swap_cached = 0; - derive_t swap_free = 0; - derive_t swap_total = 0; - derive_t swap_in = 0; - derive_t swap_out = 0; + return (0); +} /* }}} int swap_read_separate */ - if ((fh = fopen ("/proc/meminfo", "r")) == NULL) +static int swap_read_combined (void) /* {{{ */ +{ + FILE *fh; + char buffer[1024]; + + uint8_t have_data = 0; + gauge_t swap_used = 0.0; + gauge_t swap_cached = 0.0; + gauge_t swap_free = 0.0; + gauge_t swap_total = 0.0; + + fh = fopen ("/proc/meminfo", "r"); + if (fh == NULL) { char errbuf[1024]; - WARNING ("memory: fopen: %s", + WARNING ("swap plugin: fopen (/proc/meminfo) failed: %s", sstrerror (errno, errbuf, sizeof (errbuf))); return (-1); } while (fgets (buffer, sizeof (buffer), fh) != NULL) { + char *fields[8]; + int numfields; + numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields)); if (numfields < 2) continue; if (strcasecmp (fields[0], "SwapTotal:") == 0) - strtoderive (fields[1], &swap_total); + { + swap_total = strtod (fields[1], /* endptr = */ NULL); + have_data |= 0x01; + } else if (strcasecmp (fields[0], "SwapFree:") == 0) - strtoderive (fields[1], &swap_free); + { + swap_free = strtod (fields[1], /* endptr = */ NULL); + have_data |= 0x02; + } else if (strcasecmp (fields[0], "SwapCached:") == 0) - strtoderive (fields[1], &swap_cached); + { + swap_cached = strtod (fields[1], /* endptr = */ NULL); + have_data |= 0x04; + } } - if (fclose (fh)) - { - char errbuf[1024]; - WARNING ("memory: fclose: %s", - sstrerror (errno, errbuf, sizeof (errbuf))); - } + fclose (fh); - if ((swap_total == 0LL) || ((swap_free + swap_cached) > swap_total)) - return (-1); + if (have_data != 0x07) + return (ENOENT); + + if (isnan (swap_total) + || (swap_total <= 0.0) + || ((swap_free + swap_cached) > swap_total)) + return (EINVAL); swap_used = swap_total - (swap_free + swap_cached); - if ((fh = fopen ("/proc/vmstat", "r")) == NULL) + swap_submit_gauge (NULL, "used", 1024.0 * swap_used); + swap_submit_gauge (NULL, "free", 1024.0 * swap_free); + swap_submit_gauge (NULL, "cached", 1024.0 * swap_cached); + + return (0); +} /* }}} int swap_read_combined */ + +static int swap_read_io (void) /* {{{ */ +{ + FILE *fh; + char buffer[1024]; + + _Bool old_kernel = 0; + + uint8_t have_data = 0; + derive_t swap_in = 0; + derive_t swap_out = 0; + + fh = fopen ("/proc/vmstat", "r"); + if (fh == NULL) { - // /proc/vmstat does not exist in kernels <2.6 - if ((fh = fopen ("/proc/stat", "r")) == NULL ) + /* /proc/vmstat does not exist in kernels <2.6 */ + fh = fopen ("/proc/stat", "r"); + if (fh == NULL) { char errbuf[1024]; WARNING ("swap: fopen: %s", @@ -260,6 +368,9 @@ static int swap_read (void) /* {{{ */ while (fgets (buffer, sizeof (buffer), fh) != NULL) { + char *fields[8]; + int numfields; + numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields)); if (!old_kernel) @@ -268,9 +379,15 @@ static int swap_read (void) /* {{{ */ continue; if (strcasecmp ("pswpin", fields[0]) == 0) + { strtoderive (fields[1], &swap_in); + have_data |= 0x01; + } else if (strcasecmp ("pswpout", fields[0]) == 0) + { strtoderive (fields[1], &swap_out); + have_data |= 0x02; + } } else /* if (old_kernel) */ { @@ -285,18 +402,25 @@ static int swap_read (void) /* {{{ */ } } /* while (fgets) */ - if (fclose (fh)) - { - char errbuf[1024]; - WARNING ("swap: fclose: %s", - sstrerror (errno, errbuf, sizeof (errbuf))); - } + fclose (fh); + + if (have_data != 0x03) + return (ENOENT); + + swap_submit_derive (NULL, "in", swap_in); + swap_submit_derive (NULL, "out", swap_out); + + return (0); +} /* }}} int swap_read_io */ - swap_submit ("used", 1024 * swap_used, DS_TYPE_GAUGE); - swap_submit ("free", 1024 * swap_free, DS_TYPE_GAUGE); - swap_submit ("cached", 1024 * swap_cached, DS_TYPE_GAUGE); - swap_submit ("in", swap_in, DS_TYPE_DERIVE); - swap_submit ("out", swap_out, DS_TYPE_DERIVE); +static int swap_read (void) /* {{{ */ +{ + if (report_by_device) + swap_read_separate (); + else + swap_read_combined (); + + swap_read_io (); return (0); } /* }}} int swap_read */ @@ -355,9 +479,9 @@ static int swap_read_kstat (void) /* {{{ */ * pagesize); swap_avail = (derive_t) ((ai.ani_max - ai.ani_resv) * pagesize); - swap_submit ("used", swap_alloc, DS_TYPE_GAUGE); - swap_submit ("free", swap_avail, DS_TYPE_GAUGE); - swap_submit ("reserved", swap_resv, DS_TYPE_GAUGE); + swap_submit_gauge (NULL, "used", swap_alloc); + swap_submit_gauge (NULL, "free", swap_avail); + swap_submit_gauge (NULL, "reserved", swap_resv); return (0); } /* }}} int swap_read_kstat */ @@ -454,25 +578,11 @@ static int swap_read (void) /* {{{ */ continue; } - /* Okay, using "/" as swap device would be super-weird, but - * we'll handle it anyway to cover all cases. */ - if (strcmp ("/", s->swt_ent[i].ste_path) == 0) - sstrncpy (path, "root", sizeof (path)); - else - { - int j; - - s->swt_ent[i].ste_path[PATH_MAX - 1] = 0; - /* Don't copy the leading slash */ - sstrncpy (path, &s->swt_ent[i].ste_path[1], sizeof (path)); - /* Convert slashes to dashes, just like the "df" plugin. */ - for (j = 0; path[j] != 0; j++) - if (path[j] == '/') - path[j] = '-'; - } + sstrncpy (path, s->swt_ent[i].ste_path, sizeof (path)); + escape_slashes (path, sizeof (path)); - swap_submit_inst (path, "used", this_total - this_avail, DS_TYPE_GAUGE); - swap_submit_inst (path, "free", this_avail, DS_TYPE_GAUGE); + swap_submit_gauge (path, "used", (gauge_t) (this_total - this_avail)); + swap_submit_gauge (path, "free", (gauge_t) this_avail); } /* for (swap_num) */ if (total < avail) @@ -489,32 +599,14 @@ static int swap_read (void) /* {{{ */ * values have already been dispatched from within the loop. */ if (!report_by_device) { - swap_submit ("used", total - avail, DS_TYPE_GAUGE); - swap_submit ("free", avail, DS_TYPE_GAUGE); + swap_submit_gauge (NULL, "used", (gauge_t) (total - avail)); + swap_submit_gauge (NULL, "free", (gauge_t) avail); } sfree (s_paths); sfree (s); return (0); } /* }}} int swap_read */ - -/* Configuration: Present when swapctl or both methods are available. */ -static int swap_config (const char *key, const char *value) /* {{{ */ -{ - if (strcasecmp ("ReportByDevice", key) == 0) - { - if (IS_TRUE (value)) - report_by_device = 1; - else - report_by_device = 0; - } - else - { - return (-1); - } - - return (0); -} /* }}} int swap_config */ /* #endif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS */ #elif HAVE_SWAPCTL && HAVE_SWAPCTL_THREE_ARGS @@ -579,8 +671,8 @@ static int swap_read (void) /* {{{ */ return (-1); } - swap_submit ("used", used, DS_TYPE_GAUGE); - swap_submit ("free", total - used, DS_TYPE_GAUGE); + swap_submit_gauge (NULL, "used", (gauge_t) used); + swap_submit_gauge (NULL, "free", (gauge_t) (total - used)); sfree (swap_entries); @@ -606,8 +698,8 @@ static int swap_read (void) /* {{{ */ return (-1); /* The returned values are bytes. */ - swap_submit ("used", (derive_t) sw_usage.xsu_used, DS_TYPE_GAUGE); - swap_submit ("free", (derive_t) sw_usage.xsu_avail, DS_TYPE_GAUGE); + swap_submit_gauge (NULL, "used", (gauge_t) sw_usage.xsu_used); + swap_submit_gauge (NULL, "free", (gauge_t) sw_usage.xsu_avail); return (0); } /* }}} int swap_read */ @@ -639,8 +731,8 @@ static int swap_read (void) /* {{{ */ free = total - used; - swap_submit ("used", used, DS_TYPE_GAUGE); - swap_submit ("free", free, DS_TYPE_GAUGE); + swap_submit_gauge (NULL, "used", (gauge_t) used); + swap_submit_gauge (NULL, "free", (gauge_t) free); return (0); } /* }}} int swap_read */ @@ -656,8 +748,8 @@ static int swap_read (void) /* {{{ */ if (swap == NULL) return (-1); - swap_submit ("used", (derive_t) swap->used, DS_TYPE_GAUGE); - swap_submit ("free", (derive_t) swap->free, DS_TYPE_GAUGE); + swap_submit_gauge (NULL, "used", (gauge_t) swap->used); + swap_submit_gauge (NULL, "free", (gauge_t) swap->free); return (0); } /* }}} int swap_read */ @@ -673,8 +765,8 @@ static int swap_read (void) /* {{{ */ sstrerror (errno, errbuf, sizeof (errbuf))); return (-1); } - swap_submit ("used", (derive_t) (pmemory.pgsp_total - pmemory.pgsp_free) * pagesize, DS_TYPE_GAUGE); - swap_submit ("free", (derive_t) pmemory.pgsp_free * pagesize , DS_TYPE_GAUGE); + swap_submit_gauge (NULL, "used", (gauge_t) (pmemory.pgsp_total - pmemory.pgsp_free) * pagesize); + swap_submit_gauge (NULL, "free", (gauge_t) pmemory.pgsp_free * pagesize ); return (0); } /* }}} int swap_read */ @@ -682,7 +774,7 @@ static int swap_read (void) /* {{{ */ void module_register (void) { -#if HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS +#if SWAP_HAVE_CONFIG plugin_register_config ("swap", swap_config, config_keys, config_keys_num); #endif plugin_register_init ("swap", swap_init); -- 2.11.0