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kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]

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[ Upstream commit 19bd8981dc2ee35fdc81ab1b0104b607c917d470 ]

kallsyms_seqs_of_names[] records the symbol index sorted by address, the
maximum value in kallsyms_seqs_of_names[] is the number of symbols. And
2^24 = 16777216, which means that three bytes are enough to store the
index. This can help us save (1 * kallsyms_num_syms) bytes of memory.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Stable-dep-of: b022f0c7e404 ("tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhen Lei 2022-11-02 16:49:16 +08:00 • committed by Greg Kroah-Hartman
parent 3918cada8f
commit da359f699f
3 changed files with 19 additions and 6 deletions
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5
scripts/kallsyms.c
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@ -602,7 +602,10 @@ static void write_src(void)
sort_symbols_by_name();
output_label("kallsyms_seqs_of_names");
for (i = 0; i < table_cnt; i++)
printf("\t.long\t%u\n", table[i]->seq);
printf("\t.byte 0x%02x, 0x%02x, 0x%02x\n",
(unsigned char)(table[i]->seq >> 16),
(unsigned char)(table[i]->seq >> 8),
(unsigned char)(table[i]->seq >> 0));
printf("\n");
output_label("kallsyms_token_table");