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zram: add recompress flag to read_block_state()

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Add a new flag to zram block state that shows if the page was recompressed
(using alternative compression algorithm).

Link: https://lkml.kernel.org/r/20221109115047.2921851-6-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Alexey Romanov <avromanov@sberdevices.ru>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Suleiman Souhlal <suleiman@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2022-11-09 20:50:39 +09:00 committed by Andrew Morton
parent 84b33bf788
commit 60e9b39ebe
2 changed files with 9 additions and 5 deletions
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9
Documentation/admin-guide/blockdev/zram.rst
View File

@ -411,9 +411,10 @@ pages of the process with*pagemap.
If you enable the feature, you could see block state via
/sys/kernel/debug/zram/zram0/block_state". The output is as follows::
300 75.033841 .wh.
301 63.806904 s...
302 63.806919 ..hi
300 75.033841 .wh..
301 63.806904 s....
302 63.806919 ..hi.
303 62.801919 ....r
First column
zram's block index.
@ -430,6 +431,8 @@ Third column
huge page
i:
idle page
r:
recompressed page (secondary compression algorithm)
First line of above example says 300th block is accessed at 75.033841sec
and the block's state is huge so it is written back to the backing

5
drivers/block/zram/zram_drv.c
View File

@ -936,13 +936,14 @@ static ssize_t read_block_state(struct file *file, char __user *buf,
ts = ktime_to_timespec64(zram->table[index].ac_time);
copied = snprintf(kbuf + written, count,
"%12zd %12lld.%06lu %c%c%c%c\n",
"%12zd %12lld.%06lu %c%c%c%c%c\n",
index, (s64)ts.tv_sec,
ts.tv_nsec / NSEC_PER_USEC,
zram_test_flag(zram, index, ZRAM_SAME) ? 's' : '.',
zram_test_flag(zram, index, ZRAM_WB) ? 'w' : '.',
zram_test_flag(zram, index, ZRAM_HUGE) ? 'h' : '.',
zram_test_flag(zram, index, ZRAM_IDLE) ? 'i' : '.');
zram_test_flag(zram, index, ZRAM_IDLE) ? 'i' : '.',
zram_get_priority(zram, index) ? 'r' : '.');
if (count <= copied) {
zram_slot_unlock(zram, index);