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| author | Richard Qin <richard.qin.x@gmail.com> | 2026-05-02 01:48:10 +0800 |
|---|---|---|
| committer | Richard Qin <richard.qin.x@gmail.com> | 2026-05-02 01:48:10 +0800 |
| commit | ae72f8dcb029eed0f054b4c8b845868229b07038 (patch) | |
| tree | b85a0288afde4f5350e424e6cc0e12a4bad13a95 /na/mm | |
| parent | 12bd3efdbbabde0fda7d56ee82def083006e0c26 (diff) | |
| download | lume-ae72f8dcb029eed0f054b4c8b845868229b07038.tar.gz lume-ae72f8dcb029eed0f054b4c8b845868229b07038.tar.xz | |
feat: update UART handling and memory management parameters for improved functionality
Diffstat (limited to 'na/mm')
| -rw-r--r-- | na/mm/pmm.cc | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/na/mm/pmm.cc b/na/mm/pmm.cc index fc743a9..00f998c 100644 --- a/na/mm/pmm.cc +++ b/na/mm/pmm.cc @@ -24,7 +24,7 @@ #include <lume/config.h> #include <lume/fdt.h> #include <lume/new.h> -#include <lume/panic.h> +#include <lume/klog.h> #include <lume/types.h> #include <arch/cpu.h> #include <kernel/sync/spinlock.h> @@ -57,6 +57,9 @@ static uint64 g_mem_base = 0; // Physical memory base (from static uint64 g_mem_size = 0; // Total physical memory size static uint64 g_num_frames = 0; // Total managed frames +uint32 g_pcp_high_watermark = 0; +uint32 g_pcp_batch_size = 0; + /* ------------------------------------------------------------------ */ /* Address conversion helpers */ /* ------------------------------------------------------------------ */ @@ -216,7 +219,7 @@ static void buddy_free(Frame* frame, uint8 order) static void refill_pcp(PerCpuCache* pcp) { LockGuard guard(g_pmm_lock); - for (int i = 0; i < kPcpBatchSize; i++) { + for (uint32 i = 0; i < g_pcp_batch_size; i++) { Frame* f = buddy_alloc(0); if (!f) break; @@ -325,7 +328,7 @@ void pmm_free_frame(Frame* frame) pcp->count++; // Drain if over high watermark - if (pcp->count >= kPcpHighWatermark) + if (pcp->count >= g_pcp_high_watermark) drain_pcp(pcp); if (was_on) @@ -406,6 +409,15 @@ void pmm_init() g_num_frames = mem_size / kPageSize; /* + * Dynamically calculate PCP parameters based on memory size. + * Rule of thumb: batch_size = max(16, total_pages / (cpu_count * 1024)) + * This avoids depleting global memory on small RAM systems. + */ + uint32 calc_batch = static_cast<uint32>(g_num_frames / (kMaxCpus * 1024)); + g_pcp_batch_size = (calc_batch > 16) ? calc_batch : 16; + g_pcp_high_watermark = g_pcp_batch_size * 2; + + /* * 2. Place the frame_map array. * * The frame_map lives right after the kernel image (_kernel_end), |