4d4992ff58
We have two printk tests reading trace_pipe in non blocking way, with the very same code. Moving that in new read_trace_pipe_iter function. Current read_trace_pipe is used from samples/bpf and needs to do blocking read and printf of the trace_pipe data, using new read_trace_pipe_iter to implement that. Both printk tests do early checks for the number of found messages and can bail earlier, but I did not find any speed difference w/o that condition, so I did not complicate the change more for that. Some of the samples/bpf programs use read_trace_pipe function, so I kept that interface untouched. I did not see any issues with affected samples/bpf programs other than there's slight change in read_trace_pipe output. The current code uses puts that adds new line after the printed string, so we would occasionally see extra new line. With this patch we read output per lines, so there's no need to use puts and we can use just printf instead without extra new line. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/bpf/20240410140952.292261-1-jolsa@kernel.org
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __TRACE_HELPER_H
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#define __TRACE_HELPER_H
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#include <bpf/libbpf.h>
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#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
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#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
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struct ksym {
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long addr;
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char *name;
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};
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struct ksyms;
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typedef int (*ksym_cmp_t)(const void *p1, const void *p2);
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typedef int (*ksym_search_cmp_t)(const void *p1, const struct ksym *p2);
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int load_kallsyms(void);
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struct ksym *ksym_search(long key);
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long ksym_get_addr(const char *name);
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struct ksyms *load_kallsyms_local(void);
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struct ksym *ksym_search_local(struct ksyms *ksyms, long key);
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long ksym_get_addr_local(struct ksyms *ksyms, const char *name);
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void free_kallsyms_local(struct ksyms *ksyms);
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struct ksyms *load_kallsyms_custom_local(ksym_cmp_t cmp_cb);
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struct ksym *search_kallsyms_custom_local(struct ksyms *ksyms, const void *p1,
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ksym_search_cmp_t cmp_cb);
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/* open kallsyms and find addresses on the fly, faster than load + search. */
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int kallsyms_find(const char *sym, unsigned long long *addr);
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void read_trace_pipe(void);
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int read_trace_pipe_iter(void (*cb)(const char *str, void *data),
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void *data, int iter);
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ssize_t get_uprobe_offset(const void *addr);
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ssize_t get_rel_offset(uintptr_t addr);
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int read_build_id(const char *path, char *build_id, size_t size);
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#endif
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