Add benchmark suite and request timing

Makefile

@@ -7,10 +7,12 @@ OBJCOPY = aarch64-none-elf-objcopy
 KERNEL_ELF = kernel.elf
 KERNEL_BIN = kernel.bin
 TEST_ELF = kernel_test.elf
+BENCH_ELF = kernel_bench.elf
 
 # Common source files (shared between server and tests)
 COMMON_SRCS = src/drivers/uart.s \
               src/drivers/virtio.s \
+              src/drivers/timer.s \
               src/net/ethernet.s \
               src/net/arp.s \
               src/net/ipv4.s \
@@ -61,11 +63,24 @@ TEST_SRCS = src/test/test_main.s \
             src/app.s
 TEST_OBJS = $(TEST_SRCS:.s=.o)
 
+# Benchmark sources
+BENCH_SRCS = src/bench/bench_main.s \
+             src/bench/bench_harness.s \
+             src/bench/bench_slab.s \
+             src/bench/bench_db.s \
+             src/bench/bench_string.s \
+             src/bench/bench_json.s \
+             src/bench/bench_request.s \
+             $(COMMON_SRCS) \
+             $(MEM_DB_SRCS) \
+             $(SLOWAPI_SRCS)
+BENCH_OBJS = $(BENCH_SRCS:.s=.o)
+
 # Flags
 ASFLAGS = -g
 LDFLAGS = -T linker.ld -nostdlib
 
-.PHONY: all clean run test
+.PHONY: all clean run test bench
 
 all: $(KERNEL_ELF)
 
@@ -75,14 +90,17 @@ $(KERNEL_ELF): $(SERVER_OBJS) linker.ld
 $(TEST_ELF): $(TEST_OBJS) linker.ld
 	$(LD) $(LDFLAGS) -o $@ $(TEST_OBJS)
 
+$(BENCH_ELF): $(BENCH_OBJS) linker.ld
+	$(LD) $(LDFLAGS) -o $@ $(BENCH_OBJS)
+
 $(KERNEL_BIN): $(KERNEL_ELF)
 	$(OBJCOPY) -O binary $< $@
 
 %.o: %.s
 	$(AS) $(ASFLAGS) -o $@ $<
 
 clean:
-	rm -f $(SERVER_OBJS) $(TEST_OBJS) $(KERNEL_ELF) $(KERNEL_BIN) $(TEST_ELF)
+	rm -f $(SERVER_OBJS) $(TEST_OBJS) $(BENCH_OBJS) $(KERNEL_ELF) $(KERNEL_BIN) $(TEST_ELF) $(BENCH_ELF)
 
 run: $(KERNEL_ELF)
 	qemu-system-aarch64 \
@@ -103,3 +121,13 @@ test: $(TEST_ELF)
 		-kernel $(TEST_ELF) \
 		-device virtio-net-device,netdev=net0 \
 		-netdev user,id=net0
+
+bench: $(BENCH_ELF)
+	qemu-system-aarch64 \
+		-machine virt \
+		-cpu cortex-a72 \
+		-nographic \
+		-global virtio-mmio.force-legacy=true \
+		-kernel $(BENCH_ELF) \
+		-device virtio-net-device,netdev=net0 \
+		-netdev user,id=net0

src/bench/bench_db.s

@@ -0,0 +1,187 @@
+// Database Benchmarks
+
+.section .text
+.global run_db_benchmarks
+
+run_db_benchmarks:
+    stp x29, x30, [sp, #-16]!
+    mov x29, sp
+
+    ldr x0, =section_name
+    bl bench_section
+
+    ldr x0, =ctx_db_create
+    bl bench_run
+    ldr x0, =ctx_db_get
+    bl bench_run
+    ldr x0, =ctx_db_delete
+    bl bench_run
+    ldr x0, =ctx_db_list
+    bl bench_run
+
+    ldp x29, x30, [sp], #16
+    ret
+
+//=============================================================================
+// Benchmark functions
+//=============================================================================
+
+// Create + delete a record (self-contained per iteration)
+bench_fn_db_create:
+    stp x29, x30, [sp, #-16]!
+    mov x29, sp
+
+    ldr x0, =test_record
+    mov x1, #8
+    bl db_create
+    // Delete to keep db clean for next iteration
+    bl db_delete
+
+    ldp x29, x30, [sp], #16
+    ret
+
+// Get a record by ID (record created in setup)
+bench_fn_db_get:
+    stp x29, x30, [sp, #-16]!
+    mov x29, sp
+
+    ldr x0, =db_saved_id
+    ldr w0, [x0]
+    bl db_get
+
+    ldp x29, x30, [sp], #16
+    ret
+
+// Create + delete (measures delete cost, self-contained)
+bench_fn_db_delete:
+    stp x29, x30, [sp, #-16]!
+    mov x29, sp
+
+    ldr x0, =test_record
+    mov x1, #8
+    bl db_create
+    bl db_delete
+
+    ldp x29, x30, [sp], #16
+    ret
+
+// Count records
+bench_fn_db_list:
+    stp x29, x30, [sp, #-16]!
+    mov x29, sp
+
+    bl db_count
+
+    ldp x29, x30, [sp], #16
+    ret
+
+// Setup: reinit mem + db
+bench_db_setup_reinit:
+    stp x29, x30, [sp, #-16]!
+    mov x29, sp
+
+    bl mem_init
+    bl db_init
+
+    ldp x29, x30, [sp], #16
+    ret
+
+// Setup: reinit + create one record (for get benchmark)
+bench_db_setup_create:
+    stp x29, x30, [sp, #-16]!
+    mov x29, sp
+
+    bl mem_init
+    bl db_init
+    ldr x0, =test_record
+    mov x1, #8
+    bl db_create
+    ldr x1, =db_saved_id
+    str w0, [x1]
+
+    ldp x29, x30, [sp], #16
+    ret
+
+// Setup: reinit + populate 10 records (for list benchmark)
+bench_db_setup_populate:
+    stp x29, x30, [sp, #-16]!
+    mov x29, sp
+    stp x19, xzr, [sp, #-16]!
+
+    bl mem_init
+    bl db_init
+
+    mov w19, #10
+.populate_loop:
+    cbz w19, .populate_done
+    ldr x0, =test_record
+    mov x1, #8
+    bl db_create
+    sub w19, w19, #1
+    b .populate_loop
+.populate_done:
+
+    ldp x19, xzr, [sp], #16
+    ldp x29, x30, [sp], #16
+    ret
+
+//=============================================================================
+// Benchmark contexts
+//=============================================================================
+
+.section .data
+.balign 8
+ctx_db_create:
+    .quad name_db_create
+    .quad bench_fn_db_create
+    .quad bench_db_setup_reinit
+    .quad 0
+    .word 500
+    .skip 28
+
+.balign 8
+ctx_db_get:
+    .quad name_db_get
+    .quad bench_fn_db_get
+    .quad bench_db_setup_create
+    .quad 0
+    .word 1000
+    .skip 28
+
+.balign 8
+ctx_db_delete:
+    .quad name_db_delete
+    .quad bench_fn_db_delete
+    .quad bench_db_setup_reinit
+    .quad 0
+    .word 500
+    .skip 28
+
+.balign 8
+ctx_db_list:
+    .quad name_db_list
+    .quad bench_fn_db_list
+    .quad bench_db_setup_populate
+    .quad 0
+    .word 100
+    .skip 28
+
+.section .rodata
+section_name:
+    .asciz "database"
+name_db_create:
+    .asciz "db_create"
+name_db_get:
+    .asciz "db_get"
+name_db_delete:
+    .asciz "db_delete"
+name_db_list:
+    .asciz "db_list"
+
+test_record:
+    .ascii "testdata"
+
+.section .bss
+.balign 4
+db_saved_id:
+    .skip 4