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authorDenys Vlasenko2020-12-14 18:49:23 +0100
committerDenys Vlasenko2020-12-14 18:54:30 +0100
commitc7b858ff8d2e8b2d785f74b2d319bc9c839f4faa (patch)
tree9ad109d5999444dfb3a281678b6b63d2570a76cd /include
parentfd3c512f88d43e6633bd3c3110cfa0bb321adaa8 (diff)
downloadbusybox-c7b858ff8d2e8b2d785f74b2d319bc9c839f4faa.zip
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libbb: add and use infrastructure for fixed page size optimization
function old new delta procps_scan 1121 1118 -3 getpagesize 6 - -6 rpm_main 1037 1027 -10 rpm2cpio_main 120 110 -10 ptok 38 21 -17 time_main 1282 1261 -21 mkswap_main 317 278 -39 ------------------------------------------------------------------------------ (add/remove: 0/2 grow/shrink: 0/6 up/down: 0/-106) Total: -106 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'include')
-rw-r--r--include/libbb.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/libbb.h b/include/libbb.h
index a74b311..db5bf7a 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -391,6 +391,24 @@ void *mmap_read(int fd, size_t size) FAST_FUNC;
void *mmap_anon(size_t size) FAST_FUNC;
void *xmmap_anon(size_t size) FAST_FUNC;
+#if defined(__x86_64__) || defined(i386)
+# define BB_ARCH_FIXED_PAGESIZE 4096
+#else /* if defined(ARCH) */
+/* add you favorite arch today! */
+#endif
+
+#if defined BB_ARCH_FIXED_PAGESIZE
+# define IF_VARIABLE_ARCH_PAGESIZE(...) /*nothing*/
+# define bb_getpagesize() BB_ARCH_FIXED_PAGESIZE
+# define INIT_PAGESIZE(var) ((void)0)
+# define cached_pagesize(var) BB_ARCH_FIXED_PAGESIZE
+#else
+# define IF_VARIABLE_ARCH_PAGESIZE(...) __VA_ARGS__
+# define bb_getpagesize() getpagesize()
+# define INIT_PAGESIZE(var) ((var) = getpagesize())
+# define cached_pagesize(var) (var)
+#endif
+
//TODO: supply a pointer to char[11] buffer (avoid statics)?
extern const char *bb_mode_string(mode_t mode) FAST_FUNC;