On Tue, May 14, 2024 at 10:31 AM Suren Baghdasaryan <surenb@xxxxxxxxxx> wrote: > > Add version string and a header at the beginning of /proc/allocinfo to > allow later format changes. Example output: > > > head /proc/allocinfo > allocinfo - version: 1.0 > # <size> <calls> <tag info> > 0 0 init/main.c:1314 func:do_initcalls > 0 0 init/do_mounts.c:353 func:mount_nodev_root > 0 0 init/do_mounts.c:187 func:mount_root_generic > 0 0 init/do_mounts.c:158 func:do_mount_root > 0 0 init/initramfs.c:493 func:unpack_to_rootfs > 0 0 init/initramfs.c:492 func:unpack_to_rootfs > 0 0 init/initramfs.c:491 func:unpack_to_rootfs > 512 1 arch/x86/events/rapl.c:681 func:init_rapl_pmus > 128 1 arch/x86/events/rapl.c:571 func:rapl_cpu_online > > Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx> Reviewed-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx> Thank you, Pasha > --- > Changes since v1 [1]: > - Added header with field names, per Pasha Tatashin > - Fixed a spelling error in the changelog > > [1] https://lore.kernel.org/all/20240514153532.3622371-1-surenb@xxxxxxxxxx/ > > Documentation/filesystems/proc.rst | 5 ++-- > lib/alloc_tag.c | 48 ++++++++++++++++++++---------- > 2 files changed, 36 insertions(+), 17 deletions(-) > > diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst > index 245269dd6e02..4b71b3903d46 100644 > --- a/Documentation/filesystems/proc.rst > +++ b/Documentation/filesystems/proc.rst > @@ -961,13 +961,14 @@ Provides information about memory allocations at all locations in the code > base. Each allocation in the code is identified by its source file, line > number, module (if originates from a loadable module) and the function calling > the allocation. The number of bytes allocated and number of calls at each > -location are reported. > +location are reported. The first line indicates the version of the file, the > +second line is the header listing fields in the file. > > Example output. > > :: > > - > sort -rn /proc/allocinfo > + > tail -n +3 /proc/allocinfo | sort -rn > 127664128 31168 mm/page_ext.c:270 func:alloc_page_ext > 56373248 4737 mm/slub.c:2259 func:alloc_slab_page > 14880768 3633 mm/readahead.c:247 func:page_cache_ra_unbounded > diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c > index 531dbe2f5456..cbe93939332d 100644 > --- a/lib/alloc_tag.c > +++ b/lib/alloc_tag.c > @@ -16,47 +16,61 @@ EXPORT_SYMBOL(_shared_alloc_tag); > DEFINE_STATIC_KEY_MAYBE(CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT, > mem_alloc_profiling_key); > > +struct allocinfo_private { > + struct codetag_iterator iter; > + bool print_header; > + > +}; > + > static void *allocinfo_start(struct seq_file *m, loff_t *pos) > { > - struct codetag_iterator *iter; > + struct allocinfo_private *priv; > struct codetag *ct; > loff_t node = *pos; > > - iter = kzalloc(sizeof(*iter), GFP_KERNEL); > - m->private = iter; > - if (!iter) > + priv = kzalloc(sizeof(*priv), GFP_KERNEL); > + m->private = priv; > + if (!priv) > return NULL; > > + priv->print_header = (node == 0); > codetag_lock_module_list(alloc_tag_cttype, true); > - *iter = codetag_get_ct_iter(alloc_tag_cttype); > - while ((ct = codetag_next_ct(iter)) != NULL && node) > + priv->iter = codetag_get_ct_iter(alloc_tag_cttype); > + while ((ct = codetag_next_ct(&priv->iter)) != NULL && node) > node--; > > - return ct ? iter : NULL; > + return ct ? priv : NULL; > } > > static void *allocinfo_next(struct seq_file *m, void *arg, loff_t *pos) > { > - struct codetag_iterator *iter = (struct codetag_iterator *)arg; > - struct codetag *ct = codetag_next_ct(iter); > + struct allocinfo_private *priv = (struct allocinfo_private *)arg; > + struct codetag *ct = codetag_next_ct(&priv->iter); > > (*pos)++; > if (!ct) > return NULL; > > - return iter; > + return priv; > } > > static void allocinfo_stop(struct seq_file *m, void *arg) > { > - struct codetag_iterator *iter = (struct codetag_iterator *)m->private; > + struct allocinfo_private *priv = (struct allocinfo_private *)m->private; > > - if (iter) { > + if (priv) { > codetag_lock_module_list(alloc_tag_cttype, false); > - kfree(iter); > + kfree(priv); > } > } > > +static void print_allocinfo_header(struct seq_buf *buf) > +{ > + /* Output format version, so we can change it. */ > + seq_buf_printf(buf, "allocinfo - version: 1.0\n"); > + seq_buf_printf(buf, "# <size> <calls> <tag info>\n"); > +} > + > static void alloc_tag_to_text(struct seq_buf *out, struct codetag *ct) > { > struct alloc_tag *tag = ct_to_alloc_tag(ct); > @@ -71,13 +85,17 @@ static void alloc_tag_to_text(struct seq_buf *out, struct codetag *ct) > > static int allocinfo_show(struct seq_file *m, void *arg) > { > - struct codetag_iterator *iter = (struct codetag_iterator *)arg; > + struct allocinfo_private *priv = (struct allocinfo_private *)arg; > char *bufp; > size_t n = seq_get_buf(m, &bufp); > struct seq_buf buf; > > seq_buf_init(&buf, bufp, n); > - alloc_tag_to_text(&buf, iter->ct); > + if (priv->print_header) { > + print_allocinfo_header(&buf); > + priv->print_header = false; > + } > + alloc_tag_to_text(&buf, priv->iter.ct); > seq_commit(m, seq_buf_used(&buf)); > return 0; > } > > base-commit: 7e8aafe0636cdcc5c9699ced05ff1f8ffcb937e2 > -- > 2.45.0.rc1.225.g2a3ae87e7f-goog >
