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Dot not set RA_FLAG_EOF on single page files. readahead_close() will be called if RA_FLAG_EOF is there on file close. It detects readahead hit/miss, and adjust ra_expected_bytes correspondingly. Single page files are uninteresting for it. Since near 40% desktop files are <= 4k, this patch can reduce many useless readahead_close() invocations. Signed-off-by: Wu Fengguang <wfg@mail.ustc.edu.cn> --- --- linux-2.6.17-rc5-mm3.orig/mm/readahead.c +++ linux-2.6.17-rc5-mm3/mm/readahead.c @@ -1037,7 +1037,8 @@ static int ra_dispatch(struct file_ra_st ra->readahead_index = eof_index; if (ra->lookahead_index > eof_index) ra->lookahead_index = eof_index; - ra->flags |= RA_FLAG_EOF; + if (eof_index > 1) + ra->flags |= RA_FLAG_EOF; } /* Disable look-ahead for loopback file. */ -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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