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Message-ID: <16840026-35ba-cce6-4e0b-3332b0902d2a@kernel.org> Date: Wed, 13 Oct 2021 22:17:07 +0800 From: Chao Yu <chao@...nel.org> To: Daeho Jeong <daeho43@...il.com> Cc: linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com, Daeho Jeong <daehojeong@...gle.com> Subject: Re: [f2fs-dev] [PATCH] f2fs: include non-compressed blocks in compr_written_block On 2021/10/12 0:02, Daeho Jeong wrote: >>> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c >>> index c1bf9ad4c220..9b663eaf4805 100644 >>> --- a/fs/f2fs/compress.c >>> +++ b/fs/f2fs/compress.c >>> @@ -1530,6 +1530,7 @@ int f2fs_write_multi_pages(struct compress_ctx *cc, >>> if (cluster_may_compress(cc)) { >>> err = f2fs_compress_pages(cc); >>> if (err == -EAGAIN) { >>> + add_compr_block_stat(cc->inode, cc->cluster_size); >> >> Shouldn't we relocate this after 'write' label? >> >> One more concern, it looks we've changed what compr_block stat indicated, >> literally, the block we account should be compressed..., how about accounting >> it by introducing .presist_blocks, used_blocks or occupied_blocks.... thoughts? >> > > What I wanted to add here is just one case in which compression was > tried, but couldn't save any block, so gave up. > If we put this below the "write" label, we will count blocks, even if > the file is turned off for compression in "user-controlled > compression" mode. > Like the commit comment says, I want to estimate the overall compression rate. > But, if we include every other compression disabled condition, it > won't work like that. Got it, thanks for the explanation. Any thoughts about renaming compr_block? since some blocks accounted in .compr_block weren't compressed blocks. Thanks, > > Thanks, >
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