diff options
| author |   Damjan Marion <damarion@cisco.com> | 2020-09-16 21:36:00 +0200 |
|---|---|---|
| committer |   Andrew Yourtchenko <ayourtch@gmail.com> | 2020-09-17 10:38:23 +0000 |
| commit | c63e2a4f980e09b4274558f0562cee285f9741b5 (patch) | |
| tree | aff372a95841fcb4d00e9f67298497fe858f6224 /src/vppinfra/linux/mem.c | |
| parent | f6e6c788070e1421bbe7b10d449d9b65918ba561 (diff) | |
vppinfra: detect memory attributes on clib_mem_init
Type: improvement
Change-Id: I298aadfdf17d98dfb1ada1ec4f87e0821e6aeb7f
Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vppinfra/linux/mem.c')
| -rw-r--r-- | src/vppinfra/linux/mem.c | 74 |
1 files changed, 70 insertions, 4 deletions
diff --git a/src/vppinfra/linux/mem.c b/src/vppinfra/linux/mem.c index c5811816c1f..42efc007ceb 100644 --- a/src/vppinfra/linux/mem.c +++ b/src/vppinfra/linux/mem.c @@ -46,6 +46,9 @@ #define F_SEAL_WRITE 0x0008 /* prevent writes */ #endif +#ifndef MFD_HUGETLB +#define MFD_HUGETLB 0x0004U +#endif uword clib_mem_get_page_size (void) @@ -87,6 +90,73 @@ done: return 1024ULL * size; } +static clib_mem_page_sz_t +legacy_get_log2_default_hugepage_size (void) +{ + clib_mem_page_sz_t log2_page_size = CLIB_MEM_PAGE_SZ_UNKNOWN; + FILE *fp; + char tmp[33] = { }; + + if ((fp = fopen ("/proc/meminfo", "r")) == NULL) + return CLIB_MEM_PAGE_SZ_UNKNOWN; + + while (fscanf (fp, "%32s", tmp) > 0) + if (strncmp ("Hugepagesize:", tmp, 13) == 0) + { + u32 size; + if (fscanf (fp, "%u", &size) > 0) + log2_page_size = 10 + min_log2 (size); + break; + } + + fclose (fp); + return log2_page_size; +} + +void +clib_mem_main_init () +{ + clib_mem_main_t *mm = &clib_mem_main; + uword page_size; + void *va; + int fd; + + if (mm->log2_page_sz != CLIB_MEM_PAGE_SZ_UNKNOWN) + return; + + /* system page size */ + page_size = sysconf (_SC_PAGESIZE); + mm->log2_page_sz = min_log2 (page_size); + + /* default system hugeppage size */ + if ((fd = memfd_create ("test", MFD_HUGETLB)) != -1) + { + mm->log2_default_hugepage_sz = clib_mem_get_fd_log2_page_size (fd); + close (fd); + } + else /* likely kernel older than 4.14 */ + mm->log2_default_hugepage_sz = legacy_get_log2_default_hugepage_size (); + + /* numa nodes */ + va = mmap (0, page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | + MAP_ANONYMOUS, -1, 0); + if (va == MAP_FAILED) + return; + + if (mlock (va, page_size)) + goto done; + + for (int i = 0; i < CLIB_MAX_NUMAS; i++) + { + int status; + if (move_pages (0, 1, &va, &i, &status, 0) == 0) + mm->numa_node_bitmap |= 1ULL << i; + } + +done: + munmap (va, page_size); +} + u64 clib_mem_get_fd_page_size (int fd) { @@ -119,10 +189,6 @@ clib_mem_vm_randomize_va (uword * requested_va, (clib_cpu_time_now () & bit_mask) * (1ull << log2_page_size); } -#ifndef MFD_HUGETLB -#define MFD_HUGETLB 0x0004U -#endif - clib_error_t * clib_mem_create_fd (char *name, int *fdp) { |