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linux-user: Reduce lseek+reads while loading elf files.

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Define BPRM_BUF_SIZE to 1k and read that amount initially.  If the
data we want from the binary is in this buffer, use it instead of
reading from the file again.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
This commit is contained in:
Richard Henderson 2010-07-27 10:25:30 -07:00 • committed by Edgar E. Iglesias
parent d97ef72eed
commit 9955ffac9a
3 changed files with 57 additions and 71 deletions
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7
linux-user/qemu.h
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@ -31,6 +31,7 @@
* task_struct fields in the kernel
*/
struct image_info {
abi_ulong load_bias;
abi_ulong load_addr;
abi_ulong start_code;
abi_ulong end_code;
@ -144,12 +145,16 @@ extern unsigned long mmap_min_addr;
*/
#define MAX_ARG_PAGES 33
/* Read a good amount of data initially, to hopefully get all the
program headers loaded. */
#define BPRM_BUF_SIZE 1024
/*
* This structure is used to hold the arguments that are
* used when loading binaries.
*/
struct linux_binprm {
char buf[128];
char buf[BPRM_BUF_SIZE] __attribute__((aligned));
void *page[MAX_ARG_PAGES];
abi_ulong p;
int fd;