feat: add memory footprint to /stats and dashboard (#26)

* feat: add memory footprint to /stats and dashboard

Per-structure heap estimation (cache, blocklist, query log, SRTT,
overrides) with process RSS via mach_task_basic_info / sysconf.
Dashboard gets a 6th stat card and a sidebar breakdown panel with
stacked bar visualization.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: use phys_footprint on macOS to match Activity Monitor

Switch from MACH_TASK_BASIC_INFO (resident_size) to TASK_VM_INFO
(phys_footprint) which matches Activity Monitor's Memory column.
Also: capacity-aware heap estimation, entry counts in memory payload,
heap_bytes tests for all stores.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* refactor: remove redundant fields and fix naming in memory stats

Remove duplicate entry counts from MemoryStats (already in parent
StatsResponse), rename process_rss_bytes to process_memory_bytes
to match macOS phys_footprint semantics, drop restating comments.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

site/dashboard.html

@@ -101,7 +101,7 @@ body {
 /* Stat cards row */
 .stats-row {
   display: grid;
-  grid-template-columns: repeat(5, 1fr);
+  grid-template-columns: repeat(6, 1fr);
   gap: 1rem;
 }
 .stat-card {
@@ -125,6 +125,8 @@ body {
 .stat-card.blocked::before { background: var(--rose); }
 .stat-card.overrides::before { background: var(--violet); }
 .stat-card.uptime::before { background: var(--cyan); }
+.stat-card.memory::before { background: var(--text-dim); }
+.stat-card.memory .stat-value { color: var(--text-secondary); }
 
 .stat-label {
   font-size: 0.7rem;
@@ -468,10 +470,74 @@ body {
   display: none;
 }
 
+/* Memory sidebar panel */
+.memory-bar {
+  display: flex;
+  height: 18px;
+  border-radius: 4px;
+  overflow: hidden;
+  background: var(--bg-surface);
+  margin-bottom: 0.8rem;
+}
+.memory-bar-seg {
+  height: 100%;
+  min-width: 2px;
+  transition: width 0.6s ease;
+}
+.memory-bar-seg.cache { background: var(--teal); }
+.memory-bar-seg.blocklist { background: var(--rose); }
+.memory-bar-seg.querylog { background: var(--amber); }
+.memory-bar-seg.srtt { background: var(--cyan); }
+.memory-bar-seg.overrides { background: var(--violet); }
+.memory-row {
+  display: flex;
+  align-items: center;
+  padding: 0.3rem 0;
+  border-bottom: 1px solid var(--border);
+  font-family: var(--font-mono);
+  font-size: 0.72rem;
+}
+.memory-row:last-child { border-bottom: none; }
+.memory-row-dot {
+  width: 8px;
+  height: 8px;
+  border-radius: 2px;
+  flex-shrink: 0;
+  margin-right: 0.5rem;
+}
+.memory-row-label {
+  flex: 1;
+  color: var(--text-secondary);
+}
+.memory-row-size {
+  width: 65px;
+  text-align: right;
+  color: var(--text-primary);
+  font-weight: 500;
+}
+.memory-row-entries {
+  width: 90px;
+  text-align: right;
+  color: var(--text-dim);
+}
+.memory-rss {
+  margin-top: 0.5rem;
+  padding-top: 0.5rem;
+  border-top: 1px solid var(--border);
+  display: flex;
+  justify-content: space-between;
+  font-family: var(--font-mono);
+  font-size: 0.72rem;
+  color: var(--text-dim);
+}
+
 /* Responsive */
 @media (max-width: 1100px) {
   .main-grid { grid-template-columns: 1fr; }
 }
+@media (max-width: 900px) {
+  .stats-row { grid-template-columns: repeat(3, 1fr); }
+}
 @media (max-width: 700px) {
   .stats-row { grid-template-columns: repeat(2, 1fr); }
   .dashboard { padding: 1rem; }
@@ -524,6 +590,11 @@ body {
       <div class="stat-value" id="uptime">—</div>
       <div class="stat-sub" id="uptimeSub">&nbsp;</div>
     </div>
+    <div class="stat-card memory">
+      <div class="stat-label">Memory</div>
+      <div class="stat-value" id="memoryRss">—</div>
+      <div class="stat-sub" id="memorySub">&nbsp;</div>
+    </div>
   </div>
 
   <!-- Resolution paths -->
@@ -648,6 +719,17 @@ body {
         </div>
       </div>
 
+      <!-- Memory breakdown -->
+      <div class="panel" id="memoryPanel">
+        <div class="panel-header">
+          <span class="panel-title">Memory</span>
+          <span class="panel-title" id="memoryTotal" style="color: var(--text-dim)"></span>
+        </div>
+        <div class="panel-body" id="memoryBody">
+          <div class="empty-state">No memory data</div>
+        </div>
+      </div>
+
       <!-- Cache entries -->
       <div class="panel">
         <div class="panel-header">
@@ -712,6 +794,69 @@ function formatRemaining(secs) {
   return `${Math.floor(secs / 3600)}h ${Math.floor((secs % 3600) / 60)}m left`;
 }
 
+function formatBytes(bytes) {
+  if (bytes === 0) return '0 B';
+  if (bytes < 1024) return bytes + ' B';
+  if (bytes < 1048576) return (bytes / 1024).toFixed(1) + ' KB';
+  if (bytes < 1073741824) return (bytes / 1048576).toFixed(1) + ' MB';
+  return (bytes / 1073741824).toFixed(1) + ' GB';
+}
+
+const MEMORY_COMPONENTS = [
+  { key: 'cache',     label: 'Cache',     cls: 'cache',     color: 'var(--teal)' },
+  { key: 'blocklist', label: 'Blocklist',  cls: 'blocklist', color: 'var(--rose)' },
+  { key: 'query_log', label: 'Query Log',  cls: 'querylog',  color: 'var(--amber)' },
+  { key: 'srtt',      label: 'SRTT',       cls: 'srtt',      color: 'var(--cyan)' },
+  { key: 'overrides', label: 'Overrides',  cls: 'overrides', color: 'var(--violet)' },
+];
+
+function renderMemory(mem, stats) {
+  if (!mem) return;
+
+  // Stat card
+  document.getElementById('memoryRss').textContent = formatBytes(mem.process_memory_bytes);
+  document.getElementById('memorySub').textContent = 'est. ' + formatBytes(mem.total_estimated_bytes);
+
+  const entryCounts = {
+    cache: stats.cache.entries,
+    blocklist: stats.blocking.domains_loaded,
+    query_log: mem.query_log_entries,
+    srtt: mem.srtt_entries,
+    overrides: stats.overrides.active,
+  };
+
+  // Sidebar panel
+  const total = mem.total_estimated_bytes || 1;
+  document.getElementById('memoryTotal').textContent = formatBytes(total);
+
+  const barSegments = MEMORY_COMPONENTS.map(c => {
+    const bytes = mem[c.key + '_bytes'] || 0;
+    const pct = ((bytes / total) * 100).toFixed(1);
+    return `<div class="memory-bar-seg ${c.cls}" style="width:${pct}%" title="${c.label}: ${formatBytes(bytes)} (${pct}%)"></div>`;
+  }).join('');
+
+  const rows = MEMORY_COMPONENTS.map(c => {
+    const bytes = mem[c.key + '_bytes'] || 0;
+    const entries = entryCounts[c.key] || 0;
+    return `
+      <div class="memory-row">
+        <div class="memory-row-dot" style="background:${c.color}"></div>
+        <span class="memory-row-label">${c.label}</span>
+        <span class="memory-row-size">${formatBytes(bytes)}</span>
+        <span class="memory-row-entries">${formatNumber(entries)} entries</span>
+      </div>`;
+  }).join('');
+
+  document.getElementById('memoryBody').innerHTML = `
+    <div class="memory-bar">${barSegments}</div>
+    ${rows}
+    <div class="memory-rss">
+      <span>Process Footprint</span>
+      <span>${formatBytes(mem.process_memory_bytes)}</span>
+    </div>
+  `;
+}
+
 const PATH_DEFS = [
   { key: 'forwarded', label: 'Forward', cls: 'forward' },
   { key: 'recursive', label: 'Recursive', cls: 'recursive' },
@@ -960,6 +1105,7 @@ async function refresh() {
     renderServices(services);
     renderBlockingInfo(blockingInfo);
     renderAllowlist(allowlist);
+    renderMemory(stats.memory, stats);
 
   } catch (err) {
     document.getElementById('statusDot').className = 'status-dot error';

src/api.rs

@@ -170,6 +170,7 @@ struct StatsResponse {
     overrides: OverrideStats,
     blocking: BlockingStatsResponse,
     lan: LanStatsResponse,
+    memory: MemoryStats,
 }
 
 #[derive(Serialize)]
@@ -210,6 +211,19 @@ struct BlockingStatsResponse {
     allowlist_size: usize,
 }
 
+#[derive(Serialize)]
+struct MemoryStats {
+    cache_bytes: usize,
+    blocklist_bytes: usize,
+    query_log_bytes: usize,
+    query_log_entries: usize,
+    srtt_bytes: usize,
+    srtt_entries: usize,
+    overrides_bytes: usize,
+    total_estimated_bytes: usize,
+    process_memory_bytes: usize,
+}
+
 #[derive(Serialize)]
 struct DiagnoseResponse {
     domain: String,
@@ -471,12 +485,29 @@ async fn query_log(
 
 async fn stats(State(ctx): State<Arc<ServerCtx>>) -> Json<StatsResponse> {
     let snap = ctx.stats.lock().unwrap().snapshot();
-    let (cache_len, cache_max) = {
+    let (cache_len, cache_max, cache_bytes) = {
         let cache = ctx.cache.read().unwrap();
-        (cache.len(), cache.max_entries())
+        (cache.len(), cache.max_entries(), cache.heap_bytes())
     };
-    let override_count = ctx.overrides.read().unwrap().active_count();
+    let (override_count, overrides_bytes) = {
-    let bl_stats = ctx.blocklist.read().unwrap().stats();
+        let ov = ctx.overrides.read().unwrap();
+        (ov.active_count(), ov.heap_bytes())
+    };
+    let (bl_stats, blocklist_bytes) = {
+        let bl = ctx.blocklist.read().unwrap();
+        (bl.stats(), bl.heap_bytes())
+    };
+    let (query_log_bytes, query_log_entries) = {
+        let log = ctx.query_log.lock().unwrap();
+        (log.heap_bytes(), log.len())
+    };
+    let (srtt_bytes, srtt_entries, srtt_enabled) = {
+        let s = ctx.srtt.read().unwrap();
+        (s.heap_bytes(), s.len(), s.is_enabled())
+    };
+
+    let total_estimated =
+        cache_bytes + blocklist_bytes + query_log_bytes + srtt_bytes + overrides_bytes;
 
     let upstream = if ctx.upstream_mode == crate::config::UpstreamMode::Recursive {
         "recursive (root hints)".to_string()
@@ -491,7 +522,7 @@ async fn stats(State(ctx): State<Arc<ServerCtx>>) -> Json<StatsResponse> {
         config_path: ctx.config_path.clone(),
         data_dir: ctx.data_dir.to_string_lossy().to_string(),
         dnssec: ctx.dnssec_enabled,
-        srtt: ctx.srtt.read().unwrap().is_enabled(),
+        srtt: srtt_enabled,
         queries: QueriesStats {
             total: snap.total,
             forwarded: snap.forwarded,
@@ -520,6 +551,17 @@ async fn stats(State(ctx): State<Arc<ServerCtx>>) -> Json<StatsResponse> {
             enabled: ctx.lan_enabled,
             peers: ctx.lan_peers.lock().unwrap().list().len(),
         },
+        memory: MemoryStats {
+            cache_bytes,
+            blocklist_bytes,
+            query_log_bytes,
+            query_log_entries,
+            srtt_bytes,
+            srtt_entries,
+            overrides_bytes,
+            total_estimated_bytes: total_estimated,
+            process_memory_bytes: crate::stats::process_memory_bytes(),
+        },
     })
 }
 

src/blocklist.rs

@@ -183,6 +183,15 @@ impl BlocklistStore {
         self.allowlist.iter().cloned().collect()
     }
 
+    pub fn heap_bytes(&self) -> usize {
+        let per_slot_overhead = std::mem::size_of::<u64>() + std::mem::size_of::<String>() + 1;
+        let domains_table = self.domains.capacity() * per_slot_overhead;
+        let domains_heap: usize = self.domains.iter().map(|d| d.capacity()).sum();
+        let allow_table = self.allowlist.capacity() * per_slot_overhead;
+        let allow_heap: usize = self.allowlist.iter().map(|d| d.capacity()).sum();
+        domains_table + domains_heap + allow_table + allow_heap
+    }
+
     pub fn stats(&self) -> BlocklistStats {
         BlocklistStats {
             enabled: self.is_enabled(),
@@ -234,6 +243,23 @@ pub fn parse_blocklist(text: &str) -> HashSet<String> {
     domains
 }
 
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn heap_bytes_grows_with_domains() {
+        let mut store = BlocklistStore::new();
+        let empty = store.heap_bytes();
+        let domains: HashSet<String> = ["example.com", "example.org", "test.net"]
+            .iter()
+            .map(|s| s.to_string())
+            .collect();
+        store.swap_domains(domains, vec![]);
+        assert!(store.heap_bytes() > empty);
+    }
+}
+
 pub async fn download_blocklists(lists: &[String]) -> Vec<(String, String)> {
     let client = reqwest::Client::builder()
         .timeout(std::time::Duration::from_secs(30))

src/cache.rs

@@ -142,6 +142,26 @@ impl DnsCache {
         self.entry_count = 0;
     }
 
+    pub fn heap_bytes(&self) -> usize {
+        let outer_slot = std::mem::size_of::<u64>()
+            + std::mem::size_of::<String>()
+            + std::mem::size_of::<HashMap<QueryType, CacheEntry>>()
+            + 1;
+        let mut total = self.entries.capacity() * outer_slot;
+        for (domain, type_map) in &self.entries {
+            total += domain.capacity();
+            let inner_slot = std::mem::size_of::<u64>()
+                + std::mem::size_of::<QueryType>()
+                + std::mem::size_of::<CacheEntry>()
+                + 1;
+            total += type_map.capacity() * inner_slot;
+            for entry in type_map.values() {
+                total += entry.packet.heap_bytes();
+            }
+        }
+        total
+    }
+
     pub fn remove(&mut self, domain: &str) {
         let domain_lower = domain.to_lowercase();
         if let Some(type_map) = self.entries.remove(&domain_lower) {
@@ -194,3 +214,23 @@ fn adjust_ttls(records: &mut [DnsRecord], new_ttl: u32) {
         record.set_ttl(new_ttl);
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::packet::DnsPacket;
+
+    #[test]
+    fn heap_bytes_grows_with_entries() {
+        let mut cache = DnsCache::new(100, 1, 3600);
+        let empty = cache.heap_bytes();
+        let mut pkt = DnsPacket::new();
+        pkt.answers.push(DnsRecord::A {
+            domain: "example.com".into(),
+            addr: "1.2.3.4".parse().unwrap(),
+            ttl: 300,
+        });
+        cache.insert("example.com", QueryType::A, &pkt);
+        assert!(cache.heap_bytes() > empty);
+    }
+}

src/override_store.rs

@@ -117,6 +117,22 @@ impl OverrideStore {
         self.entries.clear();
     }
 
+    pub fn heap_bytes(&self) -> usize {
+        let per_slot = std::mem::size_of::<u64>()
+            + std::mem::size_of::<String>()
+            + std::mem::size_of::<OverrideEntry>()
+            + 1;
+        let table = self.entries.capacity() * per_slot;
+        let heap: usize = self
+            .entries
+            .iter()
+            .map(|(k, v)| {
+                k.capacity() + v.domain.capacity() + v.target.capacity() + v.record.heap_bytes()
+            })
+            .sum();
+        table + heap
+    }
+
     pub fn active_count(&self) -> usize {
         self.entries.values().filter(|e| !e.is_expired()).count()
     }
@@ -154,3 +170,16 @@ fn parse_target(domain: &str, target: &str, ttl: u32) -> Result<(QueryType, DnsR
         },
     ))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn heap_bytes_grows_with_entries() {
+        let mut store = OverrideStore::new();
+        let empty = store.heap_bytes();
+        store.insert("example.com", "1.2.3.4", 300, None).unwrap();
+        assert!(store.heap_bytes() > empty);
+    }
+}

src/packet.rs

@@ -66,6 +66,25 @@ impl DnsPacket {
         pkt
     }
 
+    pub fn heap_bytes(&self) -> usize {
+        fn records_heap(records: &[DnsRecord]) -> usize {
+            records
+                .iter()
+                .map(|r| std::mem::size_of::<DnsRecord>() + r.heap_bytes())
+                .sum::<usize>()
+        }
+        let questions: usize = self
+            .questions
+            .iter()
+            .map(|q| std::mem::size_of::<DnsQuestion>() + q.name.capacity())
+            .sum();
+        questions
+            + records_heap(&self.answers)
+            + records_heap(&self.authorities)
+            + records_heap(&self.resources)
+            + self.edns.as_ref().map_or(0, |e| e.options.capacity())
+    }
+
     pub fn response_from(query: &DnsPacket, rescode: crate::header::ResultCode) -> DnsPacket {
         let mut resp = DnsPacket::new();
         resp.header.id = query.header.id;
@@ -591,4 +610,16 @@ mod tests {
             panic!("expected DNSKEY");
         }
     }
+
+    #[test]
+    fn heap_bytes_accounts_for_records() {
+        let mut pkt = DnsPacket::new();
+        let empty = pkt.heap_bytes();
+        pkt.answers.push(DnsRecord::A {
+            domain: "example.com".into(),
+            addr: "1.2.3.4".parse().unwrap(),
+            ttl: 300,
+        });
+        assert!(pkt.heap_bytes() > empty);
+    }
 }

src/query_log.rs

@@ -38,6 +38,21 @@ impl QueryLog {
         self.entries.push_back(entry);
     }
 
+    pub fn len(&self) -> usize {
+        self.entries.len()
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.entries.is_empty()
+    }
+
+    pub fn heap_bytes(&self) -> usize {
+        self.entries
+            .iter()
+            .map(|e| std::mem::size_of::<QueryLogEntry>() + e.domain.capacity())
+            .sum()
+    }
+
     pub fn query(&self, filter: &QueryLogFilter) -> Vec<&QueryLogEntry> {
         self.entries
             .iter()
@@ -77,3 +92,25 @@ pub struct QueryLogFilter {
     pub since: Option<SystemTime>,
     pub limit: Option<usize>,
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn heap_bytes_grows_with_entries() {
+        let mut log = QueryLog::new(100);
+        let empty = log.heap_bytes();
+        log.push(QueryLogEntry {
+            timestamp: SystemTime::now(),
+            src_addr: "127.0.0.1:1234".parse().unwrap(),
+            domain: "example.com".into(),
+            query_type: QueryType::A,
+            path: QueryPath::Forwarded,
+            rescode: ResultCode::NOERROR,
+            latency_us: 500,
+            dnssec: DnssecStatus::Indeterminate,
+        });
+        assert!(log.heap_bytes() > empty);
+    }
+}

src/record.rs

@@ -136,6 +136,46 @@ impl DnsRecord {
         }
     }
 
+    pub fn heap_bytes(&self) -> usize {
+        match self {
+            DnsRecord::A { domain, .. } => domain.capacity(),
+            DnsRecord::NS { domain, host, .. } | DnsRecord::CNAME { domain, host, .. } => {
+                domain.capacity() + host.capacity()
+            }
+            DnsRecord::MX { domain, host, .. } => domain.capacity() + host.capacity(),
+            DnsRecord::AAAA { domain, .. } => domain.capacity(),
+            DnsRecord::DNSKEY {
+                domain, public_key, ..
+            } => domain.capacity() + public_key.capacity(),
+            DnsRecord::DS { domain, digest, .. } => domain.capacity() + digest.capacity(),
+            DnsRecord::RRSIG {
+                domain,
+                signer_name,
+                signature,
+                ..
+            } => domain.capacity() + signer_name.capacity() + signature.capacity(),
+            DnsRecord::NSEC {
+                domain,
+                next_domain,
+                type_bitmap,
+                ..
+            } => domain.capacity() + next_domain.capacity() + type_bitmap.capacity(),
+            DnsRecord::NSEC3 {
+                domain,
+                salt,
+                next_hashed_owner,
+                type_bitmap,
+                ..
+            } => {
+                domain.capacity()
+                    + salt.capacity()
+                    + next_hashed_owner.capacity()
+                    + type_bitmap.capacity()
+            }
+            DnsRecord::UNKNOWN { domain, data, .. } => domain.capacity() + data.capacity(),
+        }
+    }
+
     pub fn set_ttl(&mut self, new_ttl: u32) {
         match self {
             DnsRecord::A { ttl, .. }
@@ -650,4 +690,14 @@ mod tests {
         let parsed = round_trip(&rec);
         assert_eq!(rec, parsed);
     }
+
+    #[test]
+    fn heap_bytes_reflects_string_capacity() {
+        let rec = DnsRecord::CNAME {
+            domain: "a]".repeat(100),
+            host: "b".repeat(200),
+            ttl: 60,
+        };
+        assert!(rec.heap_bytes() >= 300);
+    }
 }

src/srtt.rs

@@ -100,6 +100,14 @@ impl SrttCache {
         addrs.sort_by_key(|a| self.get(a.ip()));
     }
 
+    pub fn heap_bytes(&self) -> usize {
+        let per_slot = std::mem::size_of::<u64>()
+            + std::mem::size_of::<IpAddr>()
+            + std::mem::size_of::<SrttEntry>()
+            + 1;
+        self.entries.capacity() * per_slot
+    }
+
     pub fn len(&self) -> usize {
         self.entries.len()
     }
@@ -303,6 +311,16 @@ mod tests {
         assert_eq!(addrs, vec![sock(1), sock(2)]);
     }
 
+    #[test]
+    fn heap_bytes_grows_with_entries() {
+        let mut cache = SrttCache::new(true);
+        let empty = cache.heap_bytes();
+        for i in 1..=10u8 {
+            cache.record_rtt(ip(i), 100, false);
+        }
+        assert!(cache.heap_bytes() > empty);
+    }
+
     #[test]
     fn eviction_removes_oldest() {
         let mut cache = SrttCache::new(true);

src/stats.rs

@@ -1,5 +1,92 @@
 use std::time::Instant;
 
+/// Returns the process memory footprint in bytes, or 0 if unavailable.
+/// macOS: phys_footprint (matches Activity Monitor). Linux: RSS from /proc/self/statm.
+pub fn process_memory_bytes() -> usize {
+    #[cfg(target_os = "macos")]
+    {
+        macos_rss()
+    }
+    #[cfg(target_os = "linux")]
+    {
+        linux_rss()
+    }
+    #[cfg(not(any(target_os = "macos", target_os = "linux")))]
+    {
+        0
+    }
+}
+
+#[cfg(target_os = "macos")]
+fn macos_rss() -> usize {
+    use std::mem;
+    extern "C" {
+        fn mach_task_self() -> u32;
+        fn task_info(
+            target_task: u32,
+            flavor: u32,
+            task_info_out: *mut TaskVmInfo,
+            task_info_count: *mut u32,
+        ) -> i32;
+    }
+    // Partial task_vm_info_data_t — only fields up to phys_footprint.
+    #[repr(C)]
+    struct TaskVmInfo {
+        virtual_size: u64,
+        region_count: i32,
+        page_size: i32,
+        resident_size: u64,
+        resident_size_peak: u64,
+        device: u64,
+        device_peak: u64,
+        internal: u64,
+        internal_peak: u64,
+        external: u64,
+        external_peak: u64,
+        reusable: u64,
+        reusable_peak: u64,
+        purgeable_volatile_pmap: u64,
+        purgeable_volatile_resident: u64,
+        purgeable_volatile_virtual: u64,
+        compressed: u64,
+        compressed_peak: u64,
+        compressed_lifetime: u64,
+        phys_footprint: u64,
+    }
+    const TASK_VM_INFO: u32 = 22;
+    let mut info: TaskVmInfo = unsafe { mem::zeroed() };
+    let mut count = (mem::size_of::<TaskVmInfo>() / mem::size_of::<u32>()) as u32;
+    let kr = unsafe { task_info(mach_task_self(), TASK_VM_INFO, &mut info, &mut count) };
+    if kr == 0 {
+        info.phys_footprint as usize
+    } else {
+        0
+    }
+}
+
+#[cfg(target_os = "linux")]
+fn linux_rss() -> usize {
+    extern "C" {
+        fn sysconf(name: i32) -> i64;
+    }
+    const SC_PAGESIZE: i32 = 30; // x86_64 + aarch64; differs on mips (28), sparc (29)
+    let page_size = unsafe { sysconf(SC_PAGESIZE) };
+    let page_size = if page_size > 0 {
+        page_size as usize
+    } else {
+        4096
+    };
+
+    if let Ok(statm) = std::fs::read_to_string("/proc/self/statm") {
+        if let Some(rss_pages) = statm.split_whitespace().nth(1) {
+            if let Ok(pages) = rss_pages.parse::<usize>() {
+                return pages * page_size;
+            }
+        }
+    }
+    0
+}
+
 pub struct ServerStats {
     queries_total: u64,
     queries_forwarded: u64,